321607631 has 2 divisors, whose sum is σ = 321607632. Its totient is φ = 321607630.

The previous prime is 321607603. The next prime is 321607633. The reversal of 321607631 is 136706123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321607631 - 2¹⁴ = 321591247 is a prime.

It is a super-2 number, since 2×321607631² = 206862936634864322, which contains 22 as substring.

Together with 321607633, 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 = 321607594 and 321607603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321607633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160803815 + 160803816.

It is an arithmetic number, because the mean of its divisors is an integer number (160803816).

Almost surely, 2^321607631 is an apocalyptic number.

321607631 is a deficient number, since it is larger than the sum of its proper divisors (1).

321607631 is an equidigital number, since it uses as much as digits as its factorization.

321607631 is an evil number, because the sum of its binary digits is even.

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

The square root of 321607631 is about 17933.4221775990. The cubic root of 321607631 is about 685.1338868420.

The spelling of 321607631 in words is "three hundred twenty-one million, six hundred seven thousand, six hundred thirty-one".