68831881 has 2 divisors, whose sum is σ = 68831882. Its totient is φ = 68831880.

The previous prime is 68831869. The next prime is 68831897. The reversal of 68831881 is 18813886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57836025 + 10995856 = 7605^2 + 3316^2 .

It is a cyclic number.

It is not a de Polignac number, because 68831881 - 2⁷ = 68831753 is a prime.

It is a super-2 number, since 2×68831881² = 9475655683996322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68831681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34415940 + 34415941.

It is an arithmetic number, because the mean of its divisors is an integer number (34415941).

Almost surely, 2^68831881 is an apocalyptic number.

It is an amenable number.

68831881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68831881 is an equidigital number, since it uses as much as digits as its factorization.

68831881 is an evil number, because the sum of its binary digits is even.

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

The square root of 68831881 is about 8296.4981166755. The cubic root of 68831881 is about 409.8232055529.

The spelling of 68831881 in words is "sixty-eight million, eight hundred thirty-one thousand, eight hundred eighty-one".