621002455 has 4 divisors (see below), whose sum is σ = 745202952. Its totient is φ = 496801960.

The previous prime is 621002407. The next prime is 621002467. The reversal of 621002455 is 554200126.

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

It is not a de Polignac number, because 621002455 - 2⁹ = 621001943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 62100241 + ... + 62100250.

It is an arithmetic number, because the mean of its divisors is an integer number (186300738).

Almost surely, 2^621002455 is an apocalyptic number.

621002455 is a deficient number, since it is larger than the sum of its proper divisors (124200497).

621002455 is a wasteful number, since it uses less digits than its factorization.

621002455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124200496.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 621002455 is about 24919.9208465838. The cubic root of 621002455 is about 853.1612182202.

The spelling of 621002455 in words is "six hundred twenty-one million, two thousand, four hundred fifty-five".