131419991 has 2 divisors, whose sum is σ = 131419992. Its totient is φ = 131419990.

The previous prime is 131419931. The next prime is 131420027. The reversal of 131419991 is 199914131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131419991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131419931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65709995 + 65709996.

It is an arithmetic number, because the mean of its divisors is an integer number (65709996).

Almost surely, 2^131419991 is an apocalyptic number.

131419991 is a deficient number, since it is larger than the sum of its proper divisors (1).

131419991 is an equidigital number, since it uses as much as digits as its factorization.

131419991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 131419991 is about 11463.8558521991. The cubic root of 131419991 is about 508.4174846860.

It can be divided in two parts, 13141 and 9991, that added together give a palindrome (23132).

The spelling of 131419991 in words is "one hundred thirty-one million, four hundred nineteen thousand, nine hundred ninety-one".