1231303513 has 16 divisors (see below), whose sum is σ = 1395418752. Its totient is φ = 1076656000.

The previous prime is 1231303511. The next prime is 1231303517. The reversal of 1231303513 is 3153031321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1231303513 - 2¹ = 1231303511 is a prime.

It is a super-2 number, since 2×1231303513² = 3032216682252282338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231303511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12795 + ... + 51247.

It is an arithmetic number, because the mean of its divisors is an integer number (87213672).

Almost surely, 2^1231303513 is an apocalyptic number.

It is an amenable number.

1231303513 is a deficient number, since it is larger than the sum of its proper divisors (164115239).

1231303513 is a wasteful number, since it uses less digits than its factorization.

1231303513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38576.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 1231303513 is about 35089.9346394376. The cubic root of 1231303513 is about 1071.8196286458.

Adding to 1231303513 its reverse (3153031321), we get a palindrome (4384334834).

The spelling of 1231303513 in words is "one billion, two hundred thirty-one million, three hundred three thousand, five hundred thirteen".