131000509 has 2 divisors, whose sum is σ = 131000510. Its totient is φ = 131000508.

The previous prime is 131000491. The next prime is 131000531. The reversal of 131000509 is 905000131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101808100 + 29192409 = 10090^2 + 5403^2 .

It is a cyclic number.

It is not a de Polignac number, because 131000509 - 2⁷ = 131000381 is a prime.

It is a super-2 number, since 2×131000509² = 34322266716518162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131000539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65500254 + 65500255.

It is an arithmetic number, because the mean of its divisors is an integer number (65500255).

Almost surely, 2^131000509 is an apocalyptic number.

It is an amenable number.

131000509 is a deficient number, since it is larger than the sum of its proper divisors (1).

131000509 is an equidigital number, since it uses as much as digits as its factorization.

131000509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 131000509 is about 11445.5453780062. The cubic root of 131000509 is about 507.8759655949.

The spelling of 131000509 in words is "one hundred thirty-one million, five hundred nine", and thus it is an aban number.