621222979 has 4 divisors (see below), whose sum is σ = 669009376. Its totient is φ = 573436584.

The previous prime is 621222967. The next prime is 621222983. The reversal of 621222979 is 979222126.

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 621222979 - 2⁵ = 621222947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621222929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23893179 + ... + 23893204.

It is an arithmetic number, because the mean of its divisors is an integer number (167252344).

Almost surely, 2^621222979 is an apocalyptic number.

621222979 is a deficient number, since it is larger than the sum of its proper divisors (47786397).

621222979 is a wasteful number, since it uses less digits than its factorization.

621222979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47786396.

The product of its digits is 54432, while the sum is 40.

The square root of 621222979 is about 24924.3451067425. The cubic root of 621222979 is about 853.2621948787.

The spelling of 621222979 in words is "six hundred twenty-one million, two hundred twenty-two thousand, nine hundred seventy-nine".