320655631 has 2 divisors, whose sum is σ = 320655632. Its totient is φ = 320655630.

The previous prime is 320655623. The next prime is 320655659. The reversal of 320655631 is 136556023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320655631 - 2³ = 320655623 is a prime.

It is a super-2 number, since 2×320655631² = 205640067384016322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 320655593 and 320655602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320655611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160327815 + 160327816.

It is an arithmetic number, because the mean of its divisors is an integer number (160327816).

Almost surely, 2^320655631 is an apocalyptic number.

320655631 is a deficient number, since it is larger than the sum of its proper divisors (1).

320655631 is an equidigital number, since it uses as much as digits as its factorization.

320655631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 320655631 is about 17906.8598866468. The cubic root of 320655631 is about 684.4571905236.

The spelling of 320655631 in words is "three hundred twenty million, six hundred fifty-five thousand, six hundred thirty-one".