1231440233231 has 12 divisors (see below), whose sum is σ = 1333542652560. Its totient is φ = 1136637665280.

The previous prime is 1231440233197. The next prime is 1231440233263. The reversal of 1231440233231 is 1323320441321.

It is a de Polignac number, because none of the positive numbers 2^k-1231440233231 is a prime.

It is a super-2 number, since 2×1231440233231² (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 = 1231440233194 and 1231440233203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231440293231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2358830 + ... + 2833188.

It is an arithmetic number, because the mean of its divisors is an integer number (111128554380).

Almost surely, 2^{1231440233231} is an apocalyptic number.

1231440233231 is a deficient number, since it is larger than the sum of its proper divisors (102102419329).

1231440233231 is a wasteful number, since it uses less digits than its factorization.

1231440233231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489746 (or 489733 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 1231440233231 its reverse (1323320441321), we get a palindrome (2554760674552).

The spelling of 1231440233231 in words is "one trillion, two hundred thirty-one billion, four hundred forty million, two hundred thirty-three thousand, two hundred thirty-one".