513655631 has 2 divisors, whose sum is σ = 513655632. Its totient is φ = 513655630.

The previous prime is 513655613. The next prime is 513655669. The reversal of 513655631 is 136556315.

It is a happy number.

Together with previous prime (513655613) 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 513655631 - 2¹⁸ = 513393487 is a prime.

It is a super-2 number, since 2×513655631² = 527684214516016322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 513655591 and 513655600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513655601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256827815 + 256827816.

It is an arithmetic number, because the mean of its divisors is an integer number (256827816).

Almost surely, 2^513655631 is an apocalyptic number.

513655631 is a deficient number, since it is larger than the sum of its proper divisors (1).

513655631 is an equidigital number, since it uses as much as digits as its factorization.

513655631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 35.

The square root of 513655631 is about 22663.9720922878. The cubic root of 513655631 is about 800.8613800102.

The spelling of 513655631 in words is "five hundred thirteen million, six hundred fifty-five thousand, six hundred thirty-one".