68881831 has 2 divisors, whose sum is σ = 68881832. Its totient is φ = 68881830.

The previous prime is 68881823. The next prime is 68881843. The reversal of 68881831 is 13818886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68881831 - 2³ = 68881823 is a prime.

It is a super-2 number, since 2×68881831² = 9489413283825122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68881861) 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, 34440915 + 34440916.

It is an arithmetic number, because the mean of its divisors is an integer number (34440916).

Almost surely, 2^68881831 is an apocalyptic number.

68881831 is a deficient number, since it is larger than the sum of its proper divisors (1).

68881831 is an equidigital number, since it uses as much as digits as its factorization.

68881831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 68881831 is about 8299.5078769768. The cubic root of 68881831 is about 409.9223152439.

The spelling of 68881831 in words is "sixty-eight million, eight hundred eighty-one thousand, eight hundred thirty-one".