131878431 has 6 divisors (see below), whose sum is σ = 190491080. Its totient is φ = 87918948.

The previous prime is 131878349. The next prime is 131878441. The reversal of 131878431 is 134878131.

It is not a de Polignac number, because 131878431 - 2⁹ = 131877919 is a prime.

It is a super-2 number, since 2×131878431² = 34783841126043522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131878441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7326571 + ... + 7326588.

Almost surely, 2^131878431 is an apocalyptic number.

131878431 is a deficient number, since it is larger than the sum of its proper divisors (58612649).

131878431 is a wasteful number, since it uses less digits than its factorization.

131878431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14653165 (or 14653162 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 131878431 is about 11483.8334627423. The cubic root of 131878431 is about 509.0079793614.

The spelling of 131878431 in words is "one hundred thirty-one million, eight hundred seventy-eight thousand, four hundred thirty-one".