68619731 has 2 divisors, whose sum is σ = 68619732. Its totient is φ = 68619730.

The previous prime is 68619679. The next prime is 68619737. The reversal of 68619731 is 13791686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68619731 - 2²⁶ = 1510867 is a prime.

It is a super-2 number, since 2×68619731² = 9417334965024722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (68619737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34309865 + 34309866.

It is an arithmetic number, because the mean of its divisors is an integer number (34309866).

Almost surely, 2^68619731 is an apocalyptic number.

68619731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68619731 is an equidigital number, since it uses as much as digits as its factorization.

68619731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 68619731 is about 8283.7027348885. The cubic root of 68619731 is about 409.4017270665.

The spelling of 68619731 in words is "sixty-eight million, six hundred nineteen thousand, seven hundred thirty-one".