621831231 has 12 divisors (see below), whose sum is σ = 1026515152. Its totient is φ = 355332096.

The previous prime is 621831227. The next prime is 621831247. The reversal of 621831231 is 132138126.

It is a happy number.

621831231 is a `hidden beast` number, since 621 + 8 + 3 + 1 + 2 + 31 = 666.

It is not a de Polignac number, because 621831231 - 2² = 621831227 is a prime.

It is a super-2 number, since 2×621831231² = 773348159693950722, 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 = 621831195 and 621831204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621831211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4935106 + ... + 4935231.

Almost surely, 2^621831231 is an apocalyptic number.

621831231 is a deficient number, since it is larger than the sum of its proper divisors (404683921).

621831231 is a wasteful number, since it uses less digits than its factorization.

621831231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9870350 (or 9870347 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 621831231 is about 24936.5440869420. The cubic root of 621831231 is about 853.5405861375.

Adding to 621831231 its reverse (132138126), we get a palindrome (753969357).

The spelling of 621831231 in words is "six hundred twenty-one million, eight hundred thirty-one thousand, two hundred thirty-one".