131440091 has 2 divisors, whose sum is σ = 131440092. Its totient is φ = 131440090.

The previous prime is 131440079. The next prime is 131440117. The reversal of 131440091 is 190044131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131440091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (131440061) 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 as a sum of consecutive naturals, namely, 65720045 + 65720046.

It is an arithmetic number, because the mean of its divisors is an integer number (65720046).

Almost surely, 2^131440091 is an apocalyptic number.

131440091 is a deficient number, since it is larger than the sum of its proper divisors (1).

131440091 is an equidigital number, since it uses as much as digits as its factorization.

131440091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 131440091 is about 11464.7324870666. The cubic root of 131440091 is about 508.4434032960.

The spelling of 131440091 in words is "one hundred thirty-one million, four hundred forty thousand, ninety-one".