1231423976544 has 48 divisors (see below), whose sum is σ = 3285479559600. Its totient is φ = 403745564160.

The previous prime is 1231423976543. The next prime is 1231423976597. The reversal of 1231423976544 is 4456793241321.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231423976543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105136219 + ... + 105147930.

It is an arithmetic number, because the mean of its divisors is an integer number (68447490825).

Almost surely, 2^{1231423976544} is an apocalyptic number.

It is an amenable number.

1231423976544 is an abundant number, since it is smaller than the sum of its proper divisors (2054055583056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231423976544 is a wasteful number, since it uses less digits than its factorization.

1231423976544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210284223 (or 210284215 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The spelling of 1231423976544 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, nine hundred seventy-six thousand, five hundred forty-four".