1231220133131 has 8 divisors (see below), whose sum is σ = 1235326480080. Its totient is φ = 1227114409248.

The previous prime is 1231220133109. The next prime is 1231220133161. The reversal of 1231220133131 is 1313310221321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231220133131 - 2⁶ = 1231220133067 is a prime.

It is a super-2 number, since 2×1231220133131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231220133097 and 1231220133106.

It is not an unprimeable number, because it can be changed into a prime (1231220133161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3986105 + ... + 4283861.

It is an arithmetic number, because the mean of its divisors is an integer number (154415810010).

Almost surely, 2^{1231220133131} is an apocalyptic number.

1231220133131 is a deficient number, since it is larger than the sum of its proper divisors (4106346949).

1231220133131 is a wasteful number, since it uses less digits than its factorization.

1231220133131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311533.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1231220133131 its reverse (1313310221321), we get a palindrome (2544530354452).

The spelling of 1231220133131 in words is "one trillion, two hundred thirty-one billion, two hundred twenty million, one hundred thirty-three thousand, one hundred thirty-one".