131431399 has 16 divisors (see below), whose sum is σ = 145626624. Its totient is φ = 117626400.

The previous prime is 131431397. The next prime is 131431423. The reversal of 131431399 is 993134131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131431399 - 2¹ = 131431397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131431397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352177 + ... + 352549.

It is an arithmetic number, because the mean of its divisors is an integer number (9101664).

Almost surely, 2^131431399 is an apocalyptic number.

131431399 is a deficient number, since it is larger than the sum of its proper divisors (14195225).

131431399 is a wasteful number, since it uses less digits than its factorization.

131431399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798.

The product of its digits is 8748, while the sum is 34.

The square root of 131431399 is about 11464.3534052296. The cubic root of 131431399 is about 508.4321954333.

The spelling of 131431399 in words is "one hundred thirty-one million, four hundred thirty-one thousand, three hundred ninety-nine".