621169989 has 16 divisors (see below), whose sum is σ = 911969280. Its totient is φ = 372946160.

The previous prime is 621169981. The next prime is 621169999. The reversal of 621169989 is 989961126.

It is a cyclic number.

It is not a de Polignac number, because 621169989 - 2³ = 621169981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621169981) 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, 84429 + ... + 91490.

It is an arithmetic number, because the mean of its divisors is an integer number (56998080).

Almost surely, 2^621169989 is an apocalyptic number.

It is an amenable number.

621169989 is a deficient number, since it is larger than the sum of its proper divisors (290799291).

621169989 is a wasteful number, since it uses less digits than its factorization.

621169989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176040.

The product of its digits is 419904, while the sum is 51.

The square root of 621169989 is about 24923.2820671757. The cubic root of 621169989 is about 853.2379332470.

The spelling of 621169989 in words is "six hundred twenty-one million, one hundred sixty-nine thousand, nine hundred eighty-nine".