1231313303331 has 6 divisors (see below), whose sum is σ = 1778563660380. Its totient is φ = 820875535548.

The previous prime is 1231313303323. The next prime is 1231313303359. The reversal of 1231313303331 is 1333033131321.

1231313303331 is a `hidden beast` number, since 1 + 2 + 3 + 13 + 13 + 303 + 331 = 666.

It is not a de Polignac number, because 1231313303331 - 2³ = 1231313303323 is a prime.

It is a super-2 number, since 2×1231313303331² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231313303295 and 1231313303304.

It is not an unprimeable number, because it can be changed into a prime (1231313303131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68406294621 + ... + 68406294638.

It is an arithmetic number, because the mean of its divisors is an integer number (296427276730).

Almost surely, 2^{1231313303331} is an apocalyptic number.

1231313303331 is a deficient number, since it is larger than the sum of its proper divisors (547250357049).

1231313303331 is a wasteful number, since it uses less digits than its factorization.

1231313303331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136812589265 (or 136812589262 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 27.

Adding to 1231313303331 its reverse (1333033131321), we get a palindrome (2564346434652).

The spelling of 1231313303331 in words is "one trillion, two hundred thirty-one billion, three hundred thirteen million, three hundred three thousand, three hundred thirty-one".