31678693921 has 8 divisors (see below), whose sum is σ = 36480590784. Its totient is φ = 26945889360.

The previous prime is 31678693897. The next prime is 31678693933. The reversal of 31678693921 is 12939687613.

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 31678693921 - 2⁷ = 31678693793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31678693421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17272090 + ... + 17273923.

It is an arithmetic number, because the mean of its divisors is an integer number (4560073848).

Almost surely, 2^31678693921 is an apocalyptic number.

It is an amenable number.

31678693921 is a deficient number, since it is larger than the sum of its proper divisors (4801896863).

31678693921 is a wasteful number, since it uses less digits than its factorization.

31678693921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34546151.

The product of its digits is 2939328, while the sum is 55.

The spelling of 31678693921 in words is "thirty-one billion, six hundred seventy-eight million, six hundred ninety-three thousand, nine hundred twenty-one".