1231340211431 has 32 divisors (see below), whose sum is σ = 1506691134720. Its totient is φ = 991745164800.

The previous prime is 1231340211427. The next prime is 1231340211443. The reversal of 1231340211431 is 1341120431321.

It is a cyclic number.

It is not a de Polignac number, because 1231340211431 - 2² = 1231340211427 is a prime.

It is a super-2 number, since 2×1231340211431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231340211431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231340211461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 545885 + ... + 1661526.

It is an arithmetic number, because the mean of its divisors is an integer number (47084097960).

Almost surely, 2^{1231340211431} is an apocalyptic number.

1231340211431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231340211431 is a deficient number, since it is larger than the sum of its proper divisors (275350923289).

1231340211431 is a wasteful number, since it uses less digits than its factorization.

1231340211431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207615.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1231340211431 its reverse (1341120431321), we get a palindrome (2572460642752).

The spelling of 1231340211431 in words is "one trillion, two hundred thirty-one billion, three hundred forty million, two hundred eleven thousand, four hundred thirty-one".