31557746025 has 81 divisors (see below), whose sum is σ = 61273102917. Its totient is φ = 15519067200.

The previous prime is 31557746023. The next prime is 31557746047. The reversal of 31557746025 is 52064775513.

It is a happy number.

The square root of 31557746025 is 177645.

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

31557746025 is a `hidden beast` number, since 3 + 1 + 557 + 74 + 6 + 0 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8134055721 + 23423690304 = 90189^2 + 153048^2 .

It is not a de Polignac number, because 31557746025 - 2¹ = 31557746023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (31557746023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 34640320 + ... + 34641230.

Almost surely, 2^31557746025 is an apocalyptic number.

31557746025 is the 177645-th square number.

31557746025 is the 88823-rd centered octagonal number.

It is an amenable number.

31557746025 is a deficient number, since it is larger than the sum of its proper divisors (29715356892).

31557746025 is an equidigital number, since it uses as much as digits as its factorization.

31557746025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 31557746025 in words is "thirty-one billion, five hundred fifty-seven million, seven hundred forty-six thousand, twenty-five".