131640497 has 2 divisors, whose sum is σ = 131640498. Its totient is φ = 131640496.

The previous prime is 131640491. The next prime is 131640511. The reversal of 131640497 is 794046131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127938721 + 3701776 = 11311^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 131640497 - 2¹⁸ = 131378353 is a prime.

It is not a weakly prime, because it can be changed into another prime (131640491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65820248 + 65820249.

It is an arithmetic number, because the mean of its divisors is an integer number (65820249).

Almost surely, 2^131640497 is an apocalyptic number.

It is an amenable number.

131640497 is a deficient number, since it is larger than the sum of its proper divisors (1).

131640497 is an equidigital number, since it uses as much as digits as its factorization.

131640497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 131640497 is about 11473.4692660938. The cubic root of 131640497 is about 508.7016790509.

The spelling of 131640497 in words is "one hundred thirty-one million, six hundred forty thousand, four hundred ninety-seven".