521974725 has 48 divisors (see below), whose sum is σ = 897918720. Its totient is φ = 267321600.

The previous prime is 521974709. The next prime is 521974727. The reversal of 521974725 is 527479125.

It is not a de Polignac number, because 521974725 - 2⁴ = 521974709 is a prime.

It is a super-2 number, since 2×521974725² = 544915227077651250, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521974727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218035 + ... + 220415.

It is an arithmetic number, because the mean of its divisors is an integer number (18706640).

Almost surely, 2^521974725 is an apocalyptic number.

It is an amenable number.

521974725 is a deficient number, since it is larger than the sum of its proper divisors (375943995).

521974725 is a wasteful number, since it uses less digits than its factorization.

521974725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510 (or 2505 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 521974725 is about 22846.7661825476. The cubic root of 521974725 is about 805.1617925125.

The spelling of 521974725 in words is "five hundred twenty-one million, nine hundred seventy-four thousand, seven hundred twenty-five".