131431433 has 4 divisors (see below), whose sum is σ = 150207360. Its totient is φ = 112655508.

The previous prime is 131431423. The next prime is 131431439. The reversal of 131431433 is 334134131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131431433 - 2²⁶ = 64322569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131431399 and 131431408.

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, 9387953 + ... + 9387966.

It is an arithmetic number, because the mean of its divisors is an integer number (37551840).

Almost surely, 2^131431433 is an apocalyptic number.

It is an amenable number.

131431433 is a deficient number, since it is larger than the sum of its proper divisors (18775927).

131431433 is an equidigital number, since it uses as much as digits as its factorization.

131431433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18775926.

The product of its digits is 1296, while the sum is 23.

The square root of 131431433 is about 11464.3548880868. The cubic root of 131431433 is about 508.4322392754.

Adding to 131431433 its reverse (334134131), we get a palindrome (465565564).

The spelling of 131431433 in words is "one hundred thirty-one million, four hundred thirty-one thousand, four hundred thirty-three".