123131423500 has 24 divisors (see below), whose sum is σ = 268919030016. Its totient is φ = 49252569200.

The previous prime is 123131423497. The next prime is 123131423533. The reversal of 123131423500 is 5324131321.

It is a happy number.

It is a super-2 number, since 2×123131423500² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123130924 + ... + 123131923.

It is an arithmetic number, because the mean of its divisors is an integer number (11204959584).

Almost surely, 2^123131423500 is an apocalyptic number.

123131423500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123131423500 is an abundant number, since it is smaller than the sum of its proper divisors (145787606516).

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

123131423500 is a wasteful number, since it uses less digits than its factorization.

123131423500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246262866 (or 246262854 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 123131423500 its reverse (5324131321), we get a palindrome (128455554821).

The spelling of 123131423500 in words is "one hundred twenty-three billion, one hundred thirty-one million, four hundred twenty-three thousand, five hundred".