320716631 has 2 divisors, whose sum is σ = 320716632. Its totient is φ = 320716630.

The previous prime is 320716619. The next prime is 320716633. The reversal of 320716631 is 136617023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320716631 - 2⁶ = 320716567 is a prime.

It is a super-2 number, since 2×320716631² = 205718314799980322, which contains 22 as substring.

Together with 320716633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 320716594 and 320716603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320716633) 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, 160358315 + 160358316.

It is an arithmetic number, because the mean of its divisors is an integer number (160358316).

Almost surely, 2^320716631 is an apocalyptic number.

320716631 is a deficient number, since it is larger than the sum of its proper divisors (1).

320716631 is an equidigital number, since it uses as much as digits as its factorization.

320716631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 320716631 is about 17908.5630635180. The cubic root of 320716631 is about 684.5005903970.

The spelling of 320716631 in words is "three hundred twenty million, seven hundred sixteen thousand, six hundred thirty-one".