621621079 has 2 divisors, whose sum is σ = 621621080. Its totient is φ = 621621078.

The previous prime is 621621073. The next prime is 621621137. The reversal of 621621079 is 970126126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621621079 - 2¹⁵ = 621588311 is a prime.

It is equal to p_32393455 and since 621621079 and 32393455 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621621073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310810539 + 310810540.

It is an arithmetic number, because the mean of its divisors is an integer number (310810540).

Almost surely, 2^621621079 is an apocalyptic number.

621621079 is a deficient number, since it is larger than the sum of its proper divisors (1).

621621079 is an equidigital number, since it uses as much as digits as its factorization.

621621079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 621621079 is about 24932.3299954096. The cubic root of 621621079 is about 853.4444220644. Note that the first 4 decimals are identical.

The spelling of 621621079 in words is "six hundred twenty-one million, six hundred twenty-one thousand, seventy-nine".