513031561 has 8 divisors (see below), whose sum is σ = 587724480. Its totient is φ = 438689328.

The previous prime is 513031481. The next prime is 513031591. The reversal of 513031561 is 165130315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 513031561 - 2⁷ = 513031433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (513031591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84526 + ... + 90391.

It is an arithmetic number, because the mean of its divisors is an integer number (73465560).

Almost surely, 2^513031561 is an apocalyptic number.

It is an amenable number.

513031561 is a deficient number, since it is larger than the sum of its proper divisors (74692919).

513031561 is a wasteful number, since it uses less digits than its factorization.

513031561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175343.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 513031561 is about 22650.2000211919. The cubic root of 513031561 is about 800.5369109319.

Adding to 513031561 its reverse (165130315), we get a palindrome (678161876).

The spelling of 513031561 in words is "five hundred thirteen million, thirty-one thousand, five hundred sixty-one".