131431432 has 16 divisors (see below), whose sum is σ = 268837200. Its totient is φ = 59741520.

The previous prime is 131431423. The next prime is 131431439. The reversal of 131431432 is 234134131.

It is a super-3 number, since 3×131431432³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (131431439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746682 + ... + 746857.

It is an arithmetic number, because the mean of its divisors is an integer number (16802325).

Almost surely, 2^131431432 is an apocalyptic number.

It is an amenable number.

131431432 is an abundant number, since it is smaller than the sum of its proper divisors (137405768).

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

131431432 is a wasteful number, since it uses less digits than its factorization.

131431432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493556 (or 1493552 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 131431432 is about 11464.3548444734. The cubic root of 131431432 is about 508.4322379859.

Adding to 131431432 its reverse (234134131), we get a palindrome (365565563).

The spelling of 131431432 in words is "one hundred thirty-one million, four hundred thirty-one thousand, four hundred thirty-two".