68661731 has 2 divisors, whose sum is σ = 68661732. Its totient is φ = 68661730.

The previous prime is 68661727. The next prime is 68661737. The reversal of 68661731 is 13716686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68661731 - 2² = 68661727 is a prime.

It is a super-2 number, since 2×68661731² = 9428866607832722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68661737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34330865 + 34330866.

It is an arithmetic number, because the mean of its divisors is an integer number (34330866).

Almost surely, 2^68661731 is an apocalyptic number.

68661731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68661731 is an equidigital number, since it uses as much as digits as its factorization.

68661731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 68661731 is about 8286.2374453065. The cubic root of 68661731 is about 409.4852373792.

The spelling of 68661731 in words is "sixty-eight million, six hundred sixty-one thousand, seven hundred thirty-one".