1531548225 has 27 divisors (see below), whose sum is σ = 2744224873. Its totient is φ = 816512640.

The previous prime is 1531548217. The next prime is 1531548233. The reversal of 1531548225 is 5228451351.

The square root of 1531548225 is 39135.

It is a perfect power (a square), and thus also a powerful number.

1531548225 is a `hidden beast` number, since 153 + 1 + 5 + 482 + 25 = 666.

It is an interprime number because it is at equal distance from previous prime (1531548217) and next prime (1531548233).

It can be written as a sum of positive squares in 4 ways, for example, as 39425841 + 1492122384 = 6279^2 + 38628^2 .

It is not a de Polignac number, because 1531548225 - 2³ = 1531548217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1531548225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 585721 + ... + 588329.

Almost surely, 2^1531548225 is an apocalyptic number.

1531548225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1531548225 is the 39135-th square number.

1531548225 is the 19568-th centered octagonal number.

It is an amenable number.

1531548225 is a deficient number, since it is larger than the sum of its proper divisors (1212676648).

1531548225 is an frugal number, since it uses more digits than its factorization.

1531548225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234 (or 2617 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The cubic root of 1531548225 is about 1152.6838952248.

Multiplying 1531548225 by its sum of digits (36), we get a square (55135736100 = 234810²).

Adding to 1531548225 its reverse (5228451351), we get a palindrome (6759999576).

The spelling of 1531548225 in words is "one billion, five hundred thirty-one million, five hundred forty-eight thousand, two hundred twenty-five".