320121631 has 12 divisors (see below), whose sum is σ = 328396432. Its totient is φ = 311992704.

The previous prime is 320121623. The next prime is 320121673. The reversal of 320121631 is 136121023.

It is not a de Polignac number, because 320121631 - 2³ = 320121623 is a prime.

It is a super-2 number, since 2×320121631² = 204955717268200322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320121599 and 320121608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320121601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1788300 + ... + 1788478.

Almost surely, 2^320121631 is an apocalyptic number.

320121631 is a deficient number, since it is larger than the sum of its proper divisors (8274801).

320121631 is an equidigital number, since it uses as much as digits as its factorization.

320121631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 320121631 is about 17891.9431868090. The cubic root of 320121631 is about 684.0770285616.

Adding to 320121631 its reverse (136121023), we get a palindrome (456242654).

The spelling of 320121631 in words is "three hundred twenty million, one hundred twenty-one thousand, six hundred thirty-one".