68013931 has 2 divisors, whose sum is σ = 68013932. Its totient is φ = 68013930.

The previous prime is 68013919. The next prime is 68013937. The reversal of 68013931 is 13931086.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68013931 - 2⁵ = 68013899 is a prime.

It is a super-2 number, since 2×68013931² = 9251789620145522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68013893 and 68013902.

It is not a weakly prime, because it can be changed into another prime (68013937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34006965 + 34006966.

It is an arithmetic number, because the mean of its divisors is an integer number (34006966).

Almost surely, 2^68013931 is an apocalyptic number.

68013931 is a deficient number, since it is larger than the sum of its proper divisors (1).

68013931 is an equidigital number, since it uses as much as digits as its factorization.

68013931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 68013931 is about 8247.0558989254. The cubic root of 68013931 is about 408.1933815911.

The spelling of 68013931 in words is "sixty-eight million, thirteen thousand, nine hundred thirty-one".