681057731 has 2 divisors, whose sum is σ = 681057732. Its totient is φ = 681057730.

The previous prime is 681057719. The next prime is 681057737. The reversal of 681057731 is 137750186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681057731 - 2¹⁰ = 681056707 is a prime.

It is a super-2 number, since 2×681057731² = 927679265909736722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681057737) 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, 340528865 + 340528866.

It is an arithmetic number, because the mean of its divisors is an integer number (340528866).

Almost surely, 2^681057731 is an apocalyptic number.

681057731 is a deficient number, since it is larger than the sum of its proper divisors (1).

681057731 is an equidigital number, since it uses as much as digits as its factorization.

681057731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 681057731 is about 26097.0828063215. The cubic root of 681057731 is about 879.8216455865.

The spelling of 681057731 in words is "six hundred eighty-one million, fifty-seven thousand, seven hundred thirty-one".