621326431 has 4 divisors (see below), whose sum is σ = 677810664. Its totient is φ = 564842200.

The previous prime is 621326383. The next prime is 621326441. The reversal of 621326431 is 134623126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621326431 - 2¹¹ = 621324383 is a prime.

It is a super-2 number, since 2×621326431² = 772093067718395522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621326431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621326441) 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 3 ways as a sum of consecutive naturals, for example, 28242100 + ... + 28242121.

It is an arithmetic number, because the mean of its divisors is an integer number (169452666).

Almost surely, 2^621326431 is an apocalyptic number.

621326431 is a deficient number, since it is larger than the sum of its proper divisors (56484233).

621326431 is a wasteful number, since it uses less digits than its factorization.

621326431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56484232.

The product of its digits is 5184, while the sum is 28.

The square root of 621326431 is about 24926.4203406747. The cubic root of 621326431 is about 853.3095567140.

Adding to 621326431 its reverse (134623126), we get a palindrome (755949557).

The spelling of 621326431 in words is "six hundred twenty-one million, three hundred twenty-six thousand, four hundred thirty-one".