131215452 has 24 divisors (see below), whose sum is σ = 324179856. Its totient is φ = 41165568.

The previous prime is 131215451. The next prime is 131215477. The reversal of 131215452 is 254512131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131215451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321403 + ... + 321810.

It is an arithmetic number, because the mean of its divisors is an integer number (13507494).

Almost surely, 2^131215452 is an apocalyptic number.

131215452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131215452 is an abundant number, since it is smaller than the sum of its proper divisors (192964404).

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

131215452 is a wasteful number, since it uses less digits than its factorization.

131215452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643237 (or 643235 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 131215452 is about 11454.9313398204. The cubic root of 131215452 is about 508.1535847023.

Adding to 131215452 its reverse (254512131), we get a palindrome (385727583).

The spelling of 131215452 in words is "one hundred thirty-one million, two hundred fifteen thousand, four hundred fifty-two".