131123564 has 24 divisors (see below), whose sum is σ = 269583888. Its totient is φ = 55016640.

The previous prime is 131123539. The next prime is 131123569. The reversal of 131123564 is 465321131.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (131123569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114047 + ... + 115190.

It is an arithmetic number, because the mean of its divisors is an integer number (11232662).

Almost surely, 2^131123564 is an apocalyptic number.

It is an amenable number.

131123564 is an abundant number, since it is smaller than the sum of its proper divisors (138460324).

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

131123564 is a wasteful number, since it uses less digits than its factorization.

131123564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229265 (or 229263 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 131123564 is about 11450.9197883838. The cubic root of 131123564 is about 508.0349398334.

Adding to 131123564 its reverse (465321131), we get a palindrome (596444695).

The spelling of 131123564 in words is "one hundred thirty-one million, one hundred twenty-three thousand, five hundred sixty-four".