679781731 has 2 divisors, whose sum is σ = 679781732. Its totient is φ = 679781730.

The previous prime is 679781701. The next prime is 679781747. The reversal of 679781731 is 137187976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679781731 - 2⁷ = 679781603 is a prime.

It is a super-2 number, since 2×679781731² = 924206403602712722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (679781701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339890865 + 339890866.

It is an arithmetic number, because the mean of its divisors is an integer number (339890866).

Almost surely, 2^679781731 is an apocalyptic number.

679781731 is a deficient number, since it is larger than the sum of its proper divisors (1).

679781731 is an equidigital number, since it uses as much as digits as its factorization.

679781731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 49.

The square root of 679781731 is about 26072.6241678892. The cubic root of 679781731 is about 879.2718369497.

The spelling of 679781731 in words is "six hundred seventy-nine million, seven hundred eighty-one thousand, seven hundred thirty-one".