513231111 has 12 divisors (see below), whose sum is σ = 745431960. Its totient is φ = 340262640.

The previous prime is 513231109. The next prime is 513231113. The reversal of 513231111 is 111132315.

It is an interprime number because it is at equal distance from previous prime (513231109) and next prime (513231113).

It is not a de Polignac number, because 513231111 - 2¹ = 513231109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513231113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155901 + ... + 159158.

It is an arithmetic number, because the mean of its divisors is an integer number (62119330).

Almost surely, 2^513231111 is an apocalyptic number.

513231111 is a deficient number, since it is larger than the sum of its proper divisors (232200849).

513231111 is a wasteful number, since it uses less digits than its factorization.

513231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315246 (or 315243 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 513231111 is about 22654.6046312885. The cubic root of 513231111 is about 800.6406904036.

Adding to 513231111 its reverse (111132315), we get a palindrome (624363426).

The spelling of 513231111 in words is "five hundred thirteen million, two hundred thirty-one thousand, one hundred eleven".