231513530044420 has 48 divisors (see below), whose sum is σ = 532159978050288. Its totient is φ = 84080575848960.

The previous prime is 231513530044417. The next prime is 231513530044441. The reversal of 231513530044420 is 24440035315132.

It can be written as a sum of positive squares in 8 ways, for example, as 83503482624576 + 148010047419844 = 9138024^2 + 12165938^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231513530044420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7298645239 + ... + 7298676958.

It is an arithmetic number, because the mean of its divisors is an integer number (11086666209381).

Almost surely, 2^{231513530044420} is an apocalyptic number.

231513530044420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231513530044420 is an abundant number, since it is smaller than the sum of its proper divisors (300646448005868).

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

231513530044420 is a wasteful number, since it uses less digits than its factorization.

231513530044420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14597322280 (or 14597322278 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 231513530044420 its reverse (24440035315132), we get a palindrome (255953565359552).

The spelling of 231513530044420 in words is "two hundred thirty-one trillion, five hundred thirteen billion, five hundred thirty million, forty-four thousand, four hundred twenty".