521172025 has 24 divisors (see below), whose sum is σ = 706704768. Its totient is φ = 378120000.

The previous prime is 521171999. The next prime is 521172037. The reversal of 521172025 is 520271125.

It is not a de Polignac number, because 521172025 - 2⁵ = 521171993 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124720 + ... + 128830.

It is an arithmetic number, because the mean of its divisors is an integer number (29446032).

Almost surely, 2^521172025 is an apocalyptic number.

521172025 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

521172025 is a deficient number, since it is larger than the sum of its proper divisors (185532743).

521172025 is a wasteful number, since it uses less digits than its factorization.

521172025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593 (or 4588 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 521172025 is about 22829.1923860657. The cubic root of 521172025 is about 804.7488510926.

The spelling of 521172025 in words is "five hundred twenty-one million, one hundred seventy-two thousand, twenty-five".