68399431 has 2 divisors, whose sum is σ = 68399432. Its totient is φ = 68399430.

The previous prime is 68399417. The next prime is 68399473. The reversal of 68399431 is 13499386.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68399431 - 2⁵ = 68399399 is a prime.

It is a super-2 number, since 2×68399431² = 9356964322247522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68399491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34199715 + 34199716.

It is an arithmetic number, because the mean of its divisors is an integer number (34199716).

Almost surely, 2^68399431 is an apocalyptic number.

68399431 is a deficient number, since it is larger than the sum of its proper divisors (1).

68399431 is an equidigital number, since it uses as much as digits as its factorization.

68399431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 68399431 is about 8270.3948515171. The cubic root of 68399431 is about 408.9631365440.

The spelling of 68399431 in words is "sixty-eight million, three hundred ninety-nine thousand, four hundred thirty-one".