521712431425 has 6 divisors (see below), whose sum is σ = 646923414998. Its totient is φ = 417369945120.

The previous prime is 521712431413. The next prime is 521712431441. The reversal of 521712431425 is 524134217125.

It can be written as a sum of positive squares in 3 ways, for example, as 1469035584 + 520243395841 = 38328^2 + 721279^2 .

It is not a de Polignac number, because 521712431425 - 2¹⁷ = 521712300353 is a prime.

It is a super-2 number, since 2×521712431425² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10434248604 + ... + 10434248653.

Almost surely, 2^521712431425 is an apocalyptic number.

It is an amenable number.

521712431425 is a deficient number, since it is larger than the sum of its proper divisors (125210983573).

521712431425 is a wasteful number, since it uses less digits than its factorization.

521712431425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20868497267 (or 20868497262 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The spelling of 521712431425 in words is "five hundred twenty-one billion, seven hundred twelve million, four hundred thirty-one thousand, four hundred twenty-five".