621620983 has 4 divisors (see below), whose sum is σ = 621727128. Its totient is φ = 621514840.

The previous prime is 621620969. The next prime is 621620999. The reversal of 621620983 is 389026126.

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 621620983 - 2²⁵ = 588066551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621620903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43741 + ... + 56182.

It is an arithmetic number, because the mean of its divisors is an integer number (155431782).

Almost surely, 2^621620983 is an apocalyptic number.

621620983 is a deficient number, since it is larger than the sum of its proper divisors (106145).

621620983 is an equidigital number, since it uses as much as digits as its factorization.

621620983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106144.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 621620983 is about 24932.3280701983. The cubic root of 621620983 is about 853.4443781306. Note that the first 3 decimals are identical.

The spelling of 621620983 in words is "six hundred twenty-one million, six hundred twenty thousand, nine hundred eighty-three".