1231525 has 6 divisors (see below), whose sum is σ = 1527122. Its totient is φ = 985200.

The previous prime is 1231513. The next prime is 1231547. The reversal of 1231525 is 5251321.

It can be written as a sum of positive squares in 3 ways, for example, as 25921 + 1205604 = 161^2 + 1098^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1231525 is a prime.

It is a Duffinian number.

1231525 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24606 + ... + 24655.

2^1231525 is an apocalyptic number.

It is an amenable number.

1231525 is a deficient number, since it is larger than the sum of its proper divisors (295597).

1231525 is an equidigital number, since it uses as much as digits as its factorization.

1231525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49271 (or 49266 counting only the distinct ones).

The product of its digits is 300, while the sum is 19.

The square root of 1231525 is about 1109.7409607652. The cubic root of 1231525 is about 107.1883891134.

Adding to 1231525 its reverse (5251321), we get a palindrome (6482846).

The spelling of 1231525 in words is "one million, two hundred thirty-one thousand, five hundred twenty-five".