621129 has 16 divisors (see below), whose sum is σ = 924480. Its totient is φ = 368640.

The previous prime is 621113. The next prime is 621133. The reversal of 621129 is 921126.

621129 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 621129 - 2⁴ = 621113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621139) 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, 649 + ... + 1289.

It is an arithmetic number, because the mean of its divisors is an integer number (57780).

2⁶²¹¹²⁹ is an apocalyptic number.

It is an amenable number.

621129 is a deficient number, since it is larger than the sum of its proper divisors (303351).

621129 is a wasteful number, since it uses less digits than its factorization.

621129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680.

The product of its digits is 216, while the sum is 21.

The square root of 621129 is about 788.1173770448. The cubic root of 621129 is about 85.3219165363.

The spelling of 621129 in words is "six hundred twenty-one thousand, one hundred twenty-nine".