31325740645 has 4 divisors (see below), whose sum is σ = 37590888780. Its totient is φ = 25060592512.

The previous prime is 31325740639. The next prime is 31325740657. The reversal of 31325740645 is 54604752313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9270223524 + 22055517121 = 96282^2 + 148511^2 .

It is a cyclic number.

It is not a de Polignac number, because 31325740645 - 2⁵ = 31325740613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31325740598 and 31325740607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132574060 + ... + 3132574069.

It is an arithmetic number, because the mean of its divisors is an integer number (9397722195).

Almost surely, 2^31325740645 is an apocalyptic number.

It is an amenable number.

31325740645 is a deficient number, since it is larger than the sum of its proper divisors (6265148135).

31325740645 is an equidigital number, since it uses as much as digits as its factorization.

31325740645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265148134.

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 31325740645 in words is "thirty-one billion, three hundred twenty-five million, seven hundred forty thousand, six hundred forty-five".