1231303131 has 24 divisors (see below), whose sum is σ = 1843430160. Its totient is φ = 791332416.

The previous prime is 1231303127. The next prime is 1231303169. The reversal of 1231303131 is 1313031321.

It is a happy number.

1231303131 is a `hidden beast` number, since 1 + 231 + 303 + 131 = 666.

It is not a de Polignac number, because 1231303131 - 2² = 1231303127 is a prime.

It is a super-2 number, since 2×1231303131² = 3032214800820806322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231303831) 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, 19336 + ... + 53258.

It is an arithmetic number, because the mean of its divisors is an integer number (76809590).

Almost surely, 2^1231303131 is an apocalyptic number.

1231303131 is a deficient number, since it is larger than the sum of its proper divisors (612127029).

1231303131 is a wasteful number, since it uses less digits than its factorization.

1231303131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34075 (or 34072 counting only the distinct ones).

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

The square root of 1231303131 is about 35089.9291962808. The cubic root of 1231303131 is about 1071.8195178052.

Adding to 1231303131 its reverse (1313031321), we get a palindrome (2544334452).

It can be divided in two parts, 1 and 231303131, that added together give a palindrome (231303132).

The spelling of 1231303131 in words is "one billion, two hundred thirty-one million, three hundred three thousand, one hundred thirty-one".