521056831 has 2 divisors, whose sum is σ = 521056832. Its totient is φ = 521056830.

The previous prime is 521056813. The next prime is 521056853. The reversal of 521056831 is 138650125.

Together with previous prime (521056813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521056831 - 2⁵ = 521056799 is a prime.

It is a super-2 number, since 2×521056831² = 543000442263525122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521056793 and 521056802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521056801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260528415 + 260528416.

It is an arithmetic number, because the mean of its divisors is an integer number (260528416).

Almost surely, 2^521056831 is an apocalyptic number.

521056831 is a deficient number, since it is larger than the sum of its proper divisors (1).

521056831 is an equidigital number, since it uses as much as digits as its factorization.

521056831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 521056831 is about 22826.6692927374. The cubic root of 521056831 is about 804.6895558468.

The spelling of 521056831 in words is "five hundred twenty-one million, fifty-six thousand, eight hundred thirty-one".