31575513025 has 27 divisors (see below), whose sum is σ = 45555039369. Its totient is φ = 21647515680.

The previous prime is 31575512987. The next prime is 31575513029. The reversal of 31575513025 is 52031557513.

The square root of 31575513025 is 177695.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6601400001 + 24974113024 = 81249^2 + 158032^2 .

It is not a de Polignac number, because 31575513025 - 2⁷ = 31575512897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31575513029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6216787 + ... + 6221863.

Almost surely, 2^31575513025 is an apocalyptic number.

31575513025 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31575513025 is the 177695-th square number.

31575513025 is the 88848-th centered octagonal number.

It is an amenable number.

31575513025 is a deficient number, since it is larger than the sum of its proper divisors (13979526344).

31575513025 is an frugal number, since it uses more digits than its factorization.

31575513025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10178 (or 5089 counting only the distinct ones).

The product of its (nonzero) digits is 78750, while the sum is 37.

The spelling of 31575513025 in words is "thirty-one billion, five hundred seventy-five million, five hundred thirteen thousand, twenty-five".