252131405 has 16 divisors (see below), whose sum is σ = 318003840. Its totient is φ = 191535168.

The previous prime is 252131381. The next prime is 252131413. The reversal of 252131405 is 504131252.

252131405 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 252131405 - 2¹⁴ = 252115021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8099 + ... + 23871.

It is an arithmetic number, because the mean of its divisors is an integer number (19875240).

Almost surely, 2^252131405 is an apocalyptic number.

It is an amenable number.

252131405 is a deficient number, since it is larger than the sum of its proper divisors (65872435).

252131405 is a wasteful number, since it uses less digits than its factorization.

252131405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15940.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 252131405 is about 15878.6461954412. The cubic root of 252131405 is about 631.7457292110.

Adding to 252131405 its reverse (504131252), we get a palindrome (756262657).

The spelling of 252131405 in words is "two hundred fifty-two million, one hundred thirty-one thousand, four hundred five".