621910899 has 16 divisors (see below), whose sum is σ = 921840640. Its totient is φ = 414386280.

The previous prime is 621910873. The next prime is 621910903. The reversal of 621910899 is 998019126.

621910899 is a `hidden beast` number, since 621 + 9 + 10 + 8 + 9 + 9 = 666.

621910899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621910899 - 2¹¹ = 621908851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621910699) 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, 57414 + ... + 67380.

It is an arithmetic number, because the mean of its divisors is an integer number (57615040).

Almost surely, 2^621910899 is an apocalyptic number.

621910899 is a deficient number, since it is larger than the sum of its proper divisors (299929741).

621910899 is a wasteful number, since it uses less digits than its factorization.

621910899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12287 (or 12281 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 621910899 is about 24938.1414503968. The cubic root of 621910899 is about 853.5770359888.

The spelling of 621910899 in words is "six hundred twenty-one million, nine hundred ten thousand, eight hundred ninety-nine".