621080009 has 16 divisors (see below), whose sum is σ = 706228224. Its totient is φ = 541069200.

The previous prime is 621079993. The next prime is 621080027. The reversal of 621080009 is 900080126.

It is a cyclic number.

It is not a de Polignac number, because 621080009 - 2⁴ = 621079993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621080009.

It is not an unprimeable number, because it can be changed into a prime (621080099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26282 + ... + 43964.

It is an arithmetic number, because the mean of its divisors is an integer number (44139264).

Almost surely, 2^621080009 is an apocalyptic number.

It is an amenable number.

621080009 is a deficient number, since it is larger than the sum of its proper divisors (85148215).

621080009 is a wasteful number, since it uses less digits than its factorization.

621080009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17828.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 621080009 is about 24921.4768623370. The cubic root of 621080009 is about 853.1967324711.

The spelling of 621080009 in words is "six hundred twenty-one million, eighty thousand, nine".