621420631 has 8 divisors (see below), whose sum is σ = 704444720. Its totient is φ = 543428352.

The previous prime is 621420617. The next prime is 621420643. The reversal of 621420631 is 136024126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621420631 - 2⁹ = 621420119 is a prime.

It is a super-2 number, since 2×621420631² = 772327201264876322, 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 = 621420596 and 621420605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621420131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257690 + ... + 1258183.

It is an arithmetic number, because the mean of its divisors is an integer number (88055590).

Almost surely, 2^621420631 is an apocalyptic number.

621420631 is a deficient number, since it is larger than the sum of its proper divisors (83024089).

621420631 is a wasteful number, since it uses less digits than its factorization.

621420631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515905.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 621420631 is about 24928.3098303916. The cubic root of 621420631 is about 853.3526782758.

Adding to 621420631 its reverse (136024126), we get a palindrome (757444757).

The spelling of 621420631 in words is "six hundred twenty-one million, four hundred twenty thousand, six hundred thirty-one".