131431408 has 20 divisors (see below), whose sum is σ = 254893408. Its totient is φ = 65652480.

The previous prime is 131431397. The next prime is 131431423. The reversal of 131431408 is 804134131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16360 + ... + 23032.

Almost surely, 2^131431408 is an apocalyptic number.

It is an amenable number.

131431408 is a deficient number, since it is larger than the sum of its proper divisors (123462000).

131431408 is a wasteful number, since it uses less digits than its factorization.

131431408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912 (or 7906 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 131431408 is about 11464.3537977507. The cubic root of 131431408 is about 508.4322070386.

Adding to 131431408 its reverse (804134131), we get a palindrome (935565539).

The spelling of 131431408 in words is "one hundred thirty-one million, four hundred thirty-one thousand, four hundred eight".