252451921 has 8 divisors (see below), whose sum is σ = 268483680. Its totient is φ = 236551488.

The previous prime is 252451891. The next prime is 252451943. The reversal of 252451921 is 129154252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252451921 - 2⁵ = 252451889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252451961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28851 + ... + 36568.

It is an arithmetic number, because the mean of its divisors is an integer number (33560460).

Almost surely, 2^252451921 is an apocalyptic number.

It is an amenable number.

252451921 is a deficient number, since it is larger than the sum of its proper divisors (16031759).

252451921 is a wasteful number, since it uses less digits than its factorization.

252451921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65663.

The product of its digits is 7200, while the sum is 31.

The square root of 252451921 is about 15888.7356639854. The cubic root of 252451921 is about 632.0133130574.

It can be divided in two parts, 2524 and 51921, that added together give a palindrome (54445).

The spelling of 252451921 in words is "two hundred fifty-two million, four hundred fifty-one thousand, nine hundred twenty-one".