1321542225 has 18 divisors (see below), whose sum is σ = 2367029366. Its totient is φ = 704822400.

The previous prime is 1321542203. The next prime is 1321542253. The reversal of 1321542225 is 5222451231.

1321542225 is a `hidden beast` number, since 1 + 3 + 215 + 422 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 30074256 + 1291467969 = 5484^2 + 35937^2 .

It is not a de Polignac number, because 1321542225 - 2¹⁰ = 1321541201 is a prime.

It is a Duffinian number.

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 17 ways as a sum of consecutive naturals, for example, 2936536 + ... + 2936985.

Almost surely, 2^1321542225 is an apocalyptic number.

1321542225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321542225 is a deficient number, since it is larger than the sum of its proper divisors (1045487141).

1321542225 is a wasteful number, since it uses less digits than its factorization.

1321542225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873537 (or 5873529 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 1321542225 is about 36353.0222264945. The cubic root of 1321542225 is about 1097.3883566296.

Adding to 1321542225 its reverse (5222451231), we get a palindrome (6543993456).

The spelling of 1321542225 in words is "one billion, three hundred twenty-one million, five hundred forty-two thousand, two hundred twenty-five".