513125031 has 4 divisors (see below), whose sum is σ = 684166712. Its totient is φ = 342083352.

The previous prime is 513125003. The next prime is 513125069. The reversal of 513125031 is 130521315.

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

It is not a de Polignac number, because 513125031 - 2⁷ = 513124903 is a prime.

It is a super-2 number, since 2×513125031² = 526594594877501922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513124989 and 513125007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513125131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85520836 + ... + 85520841.

It is an arithmetic number, because the mean of its divisors is an integer number (171041678).

Almost surely, 2^513125031 is an apocalyptic number.

513125031 is a deficient number, since it is larger than the sum of its proper divisors (171041681).

513125031 is a wasteful number, since it uses less digits than its factorization.

513125031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171041680.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 513125031 is about 22652.2632644069. The cubic root of 513125031 is about 800.5855249919.

Adding to 513125031 its reverse (130521315), we get a palindrome (643646346).

The spelling of 513125031 in words is "five hundred thirteen million, one hundred twenty-five thousand, thirty-one".