875508921 has 27 divisors (see below), whose sum is σ = 1472138031. Its totient is φ = 499935744.

The previous prime is 875508919. The next prime is 875508941. The reversal of 875508921 is 129805578.

It is a happy number.

The square root of 875508921 is 29589.

It is a perfect power (a square), and thus also a powerful number.

875508921 is a `hidden beast` number, since 8 + 7 + 550 + 8 + 92 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 864360000 = 3339^2 + 29400^2 .

It is not a de Polignac number, because 875508921 - 2¹ = 875508919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (875508901) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 620665 + ... + 622073.

Almost surely, 2^875508921 is an apocalyptic number.

875508921 is the 29589-th square number.

875508921 is the 14795-th centered octagonal number.

It is an amenable number.

875508921 is a deficient number, since it is larger than the sum of its proper divisors (596629110).

875508921 is an equidigital number, since it uses as much as digits as its factorization.

875508921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The cubic root of 875508921 is about 956.6509898945.

It can be divided in two parts, 875 and 508921, that added together give a square (509796 = 714²).

The spelling of 875508921 in words is "eight hundred seventy-five million, five hundred eight thousand, nine hundred twenty-one".