521894025 has 27 divisors (see below), whose sum is σ = 935384359. Its totient is φ = 278160720.

The previous prime is 521893973. The next prime is 521894041. The reversal of 521894025 is 520498125.

The square root of 521894025 is 22845.

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

It can be written as a sum of positive squares in only one way, i.e., 187881849 + 334012176 = 13707^2 + 18276^2 .

It is not a de Polignac number, because 521894025 - 2¹¹ = 521891977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 341914 + ... + 343436.

Almost surely, 2^521894025 is an apocalyptic number.

521894025 is the 22845-th square number.

521894025 is the 11423-rd centered octagonal number.

It is an amenable number.

521894025 is a deficient number, since it is larger than the sum of its proper divisors (413490334).

521894025 is an equidigital number, since it uses as much as digits as its factorization.

521894025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The cubic root of 521894025 is about 805.1202963107.

Multiplying 521894025 by its sum of digits (36), we get a square (18788184900 = 137070²).

The spelling of 521894025 in words is "five hundred twenty-one million, eight hundred ninety-four thousand, twenty-five".