68189931 has 28 divisors (see below), whose sum is σ = 103485240. Its totient is φ = 44906400.

The previous prime is 68189861. The next prime is 68189971. The reversal of 68189931 is 13998186.

It is not a de Polignac number, because 68189931 - 2¹⁰ = 68188907 is a prime.

It is a super-2 number, since 2×68189931² = 9299733379569522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68189971) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 64356 + ... + 65406.

Almost surely, 2^68189931 is an apocalyptic number.

68189931 is a deficient number, since it is larger than the sum of its proper divisors (35295309).

68189931 is an equidigital number, since it uses as much as digits as its factorization.

68189931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1143 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 68189931 is about 8257.7194793720. The cubic root of 68189931 is about 408.5451730274.

The spelling of 68189931 in words is "sixty-eight million, one hundred eighty-nine thousand, nine hundred thirty-one".