1231313133 has 16 divisors (see below), whose sum is σ = 1656539136. Its totient is φ = 813496320.

The previous prime is 1231313129. The next prime is 1231313143. The reversal of 1231313133 is 3313131321.

It is not a de Polignac number, because 1231313133 - 2² = 1231313129 is a prime.

It is a super-2 number, since 2×1231313133² = 3032264062996551378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231313113) 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, 590653 + ... + 592733.

It is an arithmetic number, because the mean of its divisors is an integer number (103533696).

Almost surely, 2^1231313133 is an apocalyptic number.

It is an amenable number.

1231313133 is a deficient number, since it is larger than the sum of its proper divisors (425226003).

1231313133 is a wasteful number, since it uses less digits than its factorization.

1231313133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3764.

The product of its digits is 486, while the sum is 21.

The square root of 1231313133 is about 35090.0717155152. The cubic root of 1231313133 is about 1071.8224199635.

Adding to 1231313133 its reverse (3313131321), we get a palindrome (4544444454).

The spelling of 1231313133 in words is "one billion, two hundred thirty-one million, three hundred thirteen thousand, one hundred thirty-three".