231500051440 has 80 divisors (see below), whose sum is σ = 615247050240. Its totient is φ = 79356176640.

The previous prime is 231500051437. The next prime is 231500051491. The reversal of 231500051440 is 44150005132.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3093991 + ... + 3167929.

It is an arithmetic number, because the mean of its divisors is an integer number (7690588128).

Almost surely, 2^231500051440 is an apocalyptic number.

231500051440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231500051440 is an abundant number, since it is smaller than the sum of its proper divisors (383746998800).

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

231500051440 is a wasteful number, since it uses less digits than its factorization.

231500051440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79550 (or 79544 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 231500051440 its reverse (44150005132), we get a palindrome (275650056572).

The spelling of 231500051440 in words is "two hundred thirty-one billion, five hundred million, fifty-one thousand, four hundred forty".