231540502111440 has 80 divisors (see below), whose sum is σ = 717777086284608. Its totient is φ = 61744002306048.

The previous prime is 231540502111427. The next prime is 231540502111469. The reversal of 231540502111440 is 44111205045132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×231540502111440² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173217327 + ... + 174548913.

Almost surely, 2^{231540502111440} is an apocalyptic number.

231540502111440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231540502111440 is an abundant number, since it is smaller than the sum of its proper divisors (486236584173168).

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

231540502111440 is a wasteful number, since it uses less digits than its factorization.

231540502111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056116 (or 2056110 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 231540502111440 its reverse (44111205045132), we get a palindrome (275651707156572).

The spelling of 231540502111440 in words is "two hundred thirty-one trillion, five hundred forty billion, five hundred two million, one hundred eleven thousand, four hundred forty".