522721625 has 8 divisors (see below), whose sum is σ = 652356744. Its totient is φ = 418177200.

The previous prime is 522721613. The next prime is 522721637. The reversal of 522721625 is 526127225.

It is an interprime number because it is at equal distance from previous prime (522721613) and next prime (522721637).

It can be written as a sum of positive squares in 4 ways, for example, as 97042201 + 425679424 = 9851^2 + 20632^2 .

It is not a de Polignac number, because 522721625 - 2¹² = 522717529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 522721591 and 522721600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2090762 + ... + 2091011.

It is an arithmetic number, because the mean of its divisors is an integer number (81544593).

Almost surely, 2^522721625 is an apocalyptic number.

It is an amenable number.

522721625 is a deficient number, since it is larger than the sum of its proper divisors (129635119).

522721625 is an equidigital number, since it uses as much as digits as its factorization.

522721625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4181788 (or 4181778 counting only the distinct ones).

The product of its digits is 16800, while the sum is 32.

The square root of 522721625 is about 22863.1061975402. The cubic root of 522721625 is about 805.5456480924.

The spelling of 522721625 in words is "five hundred twenty-two million, seven hundred twenty-one thousand, six hundred twenty-five".