131440434491 has 2 divisors, whose sum is σ = 131440434492. Its totient is φ = 131440434490.

The previous prime is 131440434467. The next prime is 131440434529. The reversal of 131440434491 is 194434044131.

It is an a-pointer prime, because the next prime (131440434529) can be obtained adding 131440434491 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131440434491 - 2¹⁴ = 131440418107 is a prime.

It is not a weakly prime, because it can be changed into another prime (131440434451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65720217245 + 65720217246.

It is an arithmetic number, because the mean of its divisors is an integer number (65720217246).

Almost surely, 2^131440434491 is an apocalyptic number.

131440434491 is a deficient number, since it is larger than the sum of its proper divisors (1).

131440434491 is an equidigital number, since it uses as much as digits as its factorization.

131440434491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 131440434491 in words is "one hundred thirty-one billion, four hundred forty million, four hundred thirty-four thousand, four hundred ninety-one".