1231404433231 has 12 divisors (see below), whose sum is σ = 1450582338720. Its totient is φ = 1042128884160.

The previous prime is 1231404433211. The next prime is 1231404433277. The reversal of 1231404433231 is 1323344041321.

It is not a de Polignac number, because 1231404433231 - 2³⁵ = 1197044694863 is a prime.

It is a super-2 number, since 2×1231404433231² (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 = 1231404433193 and 1231404433202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231404433211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159051210 + ... + 159058951.

It is an arithmetic number, because the mean of its divisors is an integer number (120881861560).

Almost surely, 2^{1231404433231} is an apocalyptic number.

1231404433231 is a deficient number, since it is larger than the sum of its proper divisors (219177905489).

1231404433231 is an equidigital number, since it uses as much as digits as its factorization.

1231404433231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318110254 (or 318110247 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 1231404433231 its reverse (1323344041321), we get a palindrome (2554748474552).

The spelling of 1231404433231 in words is "one trillion, two hundred thirty-one billion, four hundred four million, four hundred thirty-three thousand, two hundred thirty-one".