68463991 has 2 divisors, whose sum is σ = 68463992. Its totient is φ = 68463990.

The previous prime is 68463971. The next prime is 68464009. The reversal of 68463991 is 19936486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68463991 - 2⁵ = 68463959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68463971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34231995 + 34231996.

It is an arithmetic number, because the mean of its divisors is an integer number (34231996).

Almost surely, 2^68463991 is an apocalyptic number.

68463991 is a deficient number, since it is larger than the sum of its proper divisors (1).

68463991 is an equidigital number, since it uses as much as digits as its factorization.

68463991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 68463991 is about 8274.2970094142. The cubic root of 68463991 is about 409.0917650876.

The spelling of 68463991 in words is "sixty-eight million, four hundred sixty-three thousand, nine hundred ninety-one".