318636326731 has 2 divisors, whose sum is σ = 318636326732. Its totient is φ = 318636326730.

The previous prime is 318636326653. The next prime is 318636326737. The reversal of 318636326731 is 137623636813.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318636326731 is a prime.

It is a super-2 number, since 2×318636326731² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (318636326737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159318163365 + 159318163366.

It is an arithmetic number, because the mean of its divisors is an integer number (159318163366).

Almost surely, 2^318636326731 is an apocalyptic number.

318636326731 is a deficient number, since it is larger than the sum of its proper divisors (1).

318636326731 is an equidigital number, since it uses as much as digits as its factorization.

318636326731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 49.

The spelling of 318636326731 in words is "three hundred eighteen billion, six hundred thirty-six million, three hundred twenty-six thousand, seven hundred thirty-one".