31794985645 has 4 divisors (see below), whose sum is σ = 38153982780. Its totient is φ = 25435988512.

The previous prime is 31794985639. The next prime is 31794985657. The reversal of 31794985645 is 54658949713.

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 17998368964 + 13796616681 = 134158^2 + 117459^2 .

It is a cyclic number.

It is not a de Polignac number, because 31794985645 - 2³ = 31794985637 is a prime.

It is a super-3 number, since 3×31794985645³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3179498560 + ... + 3179498569.

It is an arithmetic number, because the mean of its divisors is an integer number (9538495695).

Almost surely, 2^31794985645 is an apocalyptic number.

It is an amenable number.

31794985645 is a deficient number, since it is larger than the sum of its proper divisors (6358997135).

31794985645 is an equidigital number, since it uses as much as digits as its factorization.

31794985645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6358997134.

The product of its digits is 32659200, while the sum is 61.

The spelling of 31794985645 in words is "thirty-one billion, seven hundred ninety-four million, nine hundred eighty-five thousand, six hundred forty-five".