131431133 has 4 divisors (see below), whose sum is σ = 131471868. Its totient is φ = 131390400.

The previous prime is 131431127. The next prime is 131431147. The reversal of 131431133 is 331134131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51811204 + 79619929 = 7198^2 + 8923^2 .

It is a cyclic number.

It is not a de Polignac number, because 131431133 - 2¹⁰ = 131430109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131431123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15068 + ... + 22133.

It is an arithmetic number, because the mean of its divisors is an integer number (32867967).

Almost surely, 2^131431133 is an apocalyptic number.

It is an amenable number.

131431133 is a deficient number, since it is larger than the sum of its proper divisors (40735).

131431133 is an equidigital number, since it uses as much as digits as its factorization.

131431133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40734.

The product of its digits is 324, while the sum is 20.

The square root of 131431133 is about 11464.3418040461. The cubic root of 131431133 is about 508.4318524329.

Adding to 131431133 its reverse (331134131), we get a palindrome (462565264).

The spelling of 131431133 in words is "one hundred thirty-one million, four hundred thirty-one thousand, one hundred thirty-three".