123115431220 has 48 divisors (see below), whose sum is σ = 267385789440. Its totient is φ = 47588246784.

The previous prime is 123115431199. The next prime is 123115431223. The reversal of 123115431220 is 22134511321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123115431223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754689 + ... + 903208.

It is an arithmetic number, because the mean of its divisors is an integer number (5570537280).

Almost surely, 2^123115431220 is an apocalyptic number.

123115431220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123115431220 is an abundant number, since it is smaller than the sum of its proper divisors (144270358220).

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

123115431220 is a wasteful number, since it uses less digits than its factorization.

123115431220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658032 (or 1658030 counting only the distinct ones).

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

Adding to 123115431220 its reverse (22134511321), we get a palindrome (145249942541).

The spelling of 123115431220 in words is "one hundred twenty-three billion, one hundred fifteen million, four hundred thirty-one thousand, two hundred twenty".