252129891 has 16 divisors (see below), whose sum is σ = 362840576. Its totient is φ = 154810656.

The previous prime is 252129881. The next prime is 252129893. The reversal of 252129891 is 198921252.

252129891 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 252129891 - 2⁶ = 252129827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252129893) 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, 11076 + ... + 25038.

It is an arithmetic number, because the mean of its divisors is an integer number (22677536).

Almost surely, 2^252129891 is an apocalyptic number.

252129891 is a deficient number, since it is larger than the sum of its proper divisors (110710685).

252129891 is a wasteful number, since it uses less digits than its factorization.

252129891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14442.

The product of its digits is 25920, while the sum is 39.

The square root of 252129891 is about 15878.5985212801. The cubic root of 252129891 is about 631.7444647051.

The spelling of 252129891 in words is "two hundred fifty-two million, one hundred twenty-nine thousand, eight hundred ninety-one".