31678693919 has 4 divisors (see below), whose sum is σ = 31724539320. Its totient is φ = 31632848520.

The previous prime is 31678693897. The next prime is 31678693933. The reversal of 31678693919 is 91939687613.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31678693919 is a prime.

It is a super-2 number, since 2×31678693919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31672693919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22921664 + ... + 22923045.

It is an arithmetic number, because the mean of its divisors is an integer number (7931134830).

Almost surely, 2^31678693919 is an apocalyptic number.

31678693919 is a deficient number, since it is larger than the sum of its proper divisors (45845401).

31678693919 is an equidigital number, since it uses as much as digits as its factorization.

31678693919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45845400.

The product of its digits is 13226976, while the sum is 62.

The spelling of 31678693919 in words is "thirty-one billion, six hundred seventy-eight million, six hundred ninety-three thousand, nine hundred nineteen".