68705831 has 2 divisors, whose sum is σ = 68705832. Its totient is φ = 68705830.

The previous prime is 68705783. The next prime is 68705839. The reversal of 68705831 is 13850786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68705831 is a prime.

It is a super-2 number, since 2×68705831² = 9440982426801122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68705839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34352915 + 34352916.

It is an arithmetic number, because the mean of its divisors is an integer number (34352916).

Almost surely, 2^68705831 is an apocalyptic number.

68705831 is a deficient number, since it is larger than the sum of its proper divisors (1).

68705831 is an equidigital number, since it uses as much as digits as its factorization.

68705831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 68705831 is about 8288.8980570399. The cubic root of 68705831 is about 409.5728865637.

The spelling of 68705831 in words is "sixty-eight million, seven hundred five thousand, eight hundred thirty-one".