662681731 has 2 divisors, whose sum is σ = 662681732. Its totient is φ = 662681730.

The previous prime is 662681713. The next prime is 662681759. The reversal of 662681731 is 137186266.

It is a happy number.

Together with previous prime (662681713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 662681731 - 2⁷ = 662681603 is a prime.

It is a super-2 number, since 2×662681731² = 878294153202312722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (662681431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331340865 + 331340866.

It is an arithmetic number, because the mean of its divisors is an integer number (331340866).

Almost surely, 2^662681731 is an apocalyptic number.

662681731 is a deficient number, since it is larger than the sum of its proper divisors (1).

662681731 is an equidigital number, since it uses as much as digits as its factorization.

662681731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 662681731 is about 25742.6053654248. The cubic root of 662681731 is about 871.8364041461.

The spelling of 662681731 in words is "six hundred sixty-two million, six hundred eighty-one thousand, seven hundred thirty-one".