31997567845 has 8 divisors (see below), whose sum is σ = 38401191576. Its totient is φ = 25595314176.

The previous prime is 31997567837. The next prime is 31997567857. The reversal of 31997567845 is 54876579913.

It can be written as a sum of positive squares in 4 ways, for example, as 13050320644 + 18947247201 = 114238^2 + 137649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31997567845 - 2³ = 31997567837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290412 + ... + 385141.

It is an arithmetic number, because the mean of its divisors is an integer number (4800148947).

Almost surely, 2^31997567845 is an apocalyptic number.

It is an amenable number.

31997567845 is a deficient number, since it is larger than the sum of its proper divisors (6403623731).

31997567845 is an equidigital number, since it uses as much as digits as its factorization.

31997567845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685031.

The product of its digits is 57153600, while the sum is 64.

The spelling of 31997567845 in words is "thirty-one billion, nine hundred ninety-seven million, five hundred sixty-seven thousand, eight hundred forty-five".