513985831 has 4 divisors (see below), whose sum is σ = 519284752. Its totient is φ = 508686912.

The previous prime is 513985819. The next prime is 513985909. The reversal of 513985831 is 138589315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 513985831 - 2⁹ = 513985319 is a prime.

It is a super-2 number, since 2×513985831² = 528362868937521122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513985631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2649315 + ... + 2649508.

It is an arithmetic number, because the mean of its divisors is an integer number (129821188).

Almost surely, 2^513985831 is an apocalyptic number.

513985831 is a deficient number, since it is larger than the sum of its proper divisors (5298921).

513985831 is an equidigital number, since it uses as much as digits as its factorization.

513985831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298920.

The product of its digits is 129600, while the sum is 43.

The square root of 513985831 is about 22671.2556114565. The cubic root of 513985831 is about 801.0329526661.

The spelling of 513985831 in words is "five hundred thirteen million, nine hundred eighty-five thousand, eight hundred thirty-one".