15231113440 has 48 divisors (see below), whose sum is σ = 37144275840. Its totient is φ = 5895912960.

The previous prime is 15231113437. The next prime is 15231113441. The reversal of 15231113440 is 4431113251.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15231113441) 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, 1530435 + ... + 1540354.

It is an arithmetic number, because the mean of its divisors is an integer number (773839080).

Almost surely, 2^15231113440 is an apocalyptic number.

15231113440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15231113440 is an abundant number, since it is smaller than the sum of its proper divisors (21913162400).

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

15231113440 is a wasteful number, since it uses less digits than its factorization.

15231113440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070835 (or 3070827 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 15231113440 its reverse (4431113251), we get a palindrome (19662226691).

The spelling of 15231113440 in words is "fifteen billion, two hundred thirty-one million, one hundred thirteen thousand, four hundred forty".