513231311 has 4 divisors (see below), whose sum is σ = 513313800. Its totient is φ = 513148824.

The previous prime is 513231307. The next prime is 513231353. The reversal of 513231311 is 113132315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113132315 = 5 ⋅22626463.

It is a cyclic number.

It is not a de Polignac number, because 513231311 - 2² = 513231307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513231371) 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, 31076 + ... + 44633.

It is an arithmetic number, because the mean of its divisors is an integer number (128328450).

Almost surely, 2^513231311 is an apocalyptic number.

513231311 is a deficient number, since it is larger than the sum of its proper divisors (82489).

513231311 is an equidigital number, since it uses as much as digits as its factorization.

513231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82488.

The product of its digits is 270, while the sum is 20.

The square root of 513231311 is about 22654.6090454018. The cubic root of 513231311 is about 800.6407944036.

Adding to 513231311 its reverse (113132315), we get a palindrome (626363626).

The spelling of 513231311 in words is "five hundred thirteen million, two hundred thirty-one thousand, three hundred eleven".