68290931 has 4 divisors (see below), whose sum is σ = 68929272. Its totient is φ = 67652592.

The previous prime is 68290919. The next prime is 68290939. The reversal of 68290931 is 13909286.

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

It is a cyclic number.

It is not a de Polignac number, because 68290931 - 2⁶ = 68290867 is a prime.

It is a super-2 number, since 2×68290931² = 9327302513693522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68290939) 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, 319010 + ... + 319223.

It is an arithmetic number, because the mean of its divisors is an integer number (17232318).

Almost surely, 2^68290931 is an apocalyptic number.

68290931 is a deficient number, since it is larger than the sum of its proper divisors (638341).

68290931 is a wasteful number, since it uses less digits than its factorization.

68290931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638340.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 68290931 is about 8263.8327064383. The cubic root of 68290931 is about 408.7467800499.

The spelling of 68290931 in words is "sixty-eight million, two hundred ninety thousand, nine hundred thirty-one".