131534431 has 4 divisors (see below), whose sum is σ = 150325072. Its totient is φ = 112743792.

The previous prime is 131534419. The next prime is 131534461. The reversal of 131534431 is 134435131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131534431 - 2²³ = 123145823 is a prime.

It is a super-2 number, since 2×131534431² = 34602613076987522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131534396 and 131534405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131534461) 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, 9395310 + ... + 9395323.

It is an arithmetic number, because the mean of its divisors is an integer number (37581268).

Almost surely, 2^131534431 is an apocalyptic number.

131534431 is a deficient number, since it is larger than the sum of its proper divisors (18790641).

131534431 is an equidigital number, since it uses as much as digits as its factorization.

131534431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18790640.

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

The square root of 131534431 is about 11468.8461058644. The cubic root of 131534431 is about 508.5650178380.

Adding to 131534431 its reverse (134435131), we get a palindrome (265969562).

The spelling of 131534431 in words is "one hundred thirty-one million, five hundred thirty-four thousand, four hundred thirty-one".