1231331013 has 24 divisors (see below), whose sum is σ = 2024642880. Its totient is φ = 713813760.

The previous prime is 1231330999. The next prime is 1231331027. The reversal of 1231331013 is 3101331321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1231330999) and next prime (1231331027).

It is not a de Polignac number, because 1231331013 - 2⁹ = 1231330501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231331053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268108 + ... + 272661.

It is an arithmetic number, because the mean of its divisors is an integer number (84360120).

Almost surely, 2^1231331013 is an apocalyptic number.

It is an amenable number.

1231331013 is a deficient number, since it is larger than the sum of its proper divisors (793311867).

1231331013 is a wasteful number, since it uses less digits than its factorization.

1231331013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540809 (or 540806 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1231331013 is about 35090.3264875093. The cubic root of 1231331013 is about 1071.8276079458.

Adding to 1231331013 its reverse (3101331321), we get a palindrome (4332662334).

The spelling of 1231331013 in words is "one billion, two hundred thirty-one million, three hundred thirty-one thousand, thirteen".