31958921394 has 12 divisors (see below), whose sum is σ = 69244329726. Its totient is φ = 10652973792.

The previous prime is 31958921387. The next prime is 31958921441. The reversal of 31958921394 is 49312985913.

31958921394 is a `hidden beast` number, since 3 + 1 + 9 + 589 + 21 + 39 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31946915169 + 12006225 = 178737^2 + 3465^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31958921394.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 887747799 + ... + 887747834.

Almost surely, 2^31958921394 is an apocalyptic number.

31958921394 is an abundant number, since it is smaller than the sum of its proper divisors (37285408332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31958921394 is a wasteful number, since it uses less digits than its factorization.

31958921394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775495641 (or 1775495638 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The spelling of 31958921394 in words is "thirty-one billion, nine hundred fifty-eight million, nine hundred twenty-one thousand, three hundred ninety-four".