621979079 has 4 divisors (see below), whose sum is σ = 654714840. Its totient is φ = 589243320.

The previous prime is 621979073. The next prime is 621979129. The reversal of 621979079 is 970979126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621979079 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 (621979073) 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, 16367852 + ... + 16367889.

It is an arithmetic number, because the mean of its divisors is an integer number (163678710).

Almost surely, 2^621979079 is an apocalyptic number.

621979079 is a deficient number, since it is larger than the sum of its proper divisors (32735761).

621979079 is a wasteful number, since it uses less digits than its factorization.

621979079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32735760.

The product of its (nonzero) digits is 428652, while the sum is 50.

The square root of 621979079 is about 24939.5083953153. The cubic root of 621979079 is about 853.6082273571.

The spelling of 621979079 in words is "six hundred twenty-one million, nine hundred seventy-nine thousand, seventy-nine".