131733509 has 2 divisors, whose sum is σ = 131733510. Its totient is φ = 131733508.

The previous prime is 131733499. The next prime is 131733521. The reversal of 131733509 is 905337131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124389409 + 7344100 = 11153^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 131733509 - 2²⁴ = 114956293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131733409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65866754 + 65866755.

It is an arithmetic number, because the mean of its divisors is an integer number (65866755).

Almost surely, 2^131733509 is an apocalyptic number.

It is an amenable number.

131733509 is a deficient number, since it is larger than the sum of its proper divisors (1).

131733509 is an equidigital number, since it uses as much as digits as its factorization.

131733509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 32.

The square root of 131733509 is about 11477.5219015256. The cubic root of 131733509 is about 508.8214603804.

The spelling of 131733509 in words is "one hundred thirty-one million, seven hundred thirty-three thousand, five hundred nine".