117581509 has 2 divisors, whose sum is σ = 117581510. Its totient is φ = 117581508.

The previous prime is 117581501. The next prime is 117581521. The reversal of 117581509 is 905185711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72624484 + 44957025 = 8522^2 + 6705^2 .

It is an emirp because it is prime and its reverse (905185711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117581509 - 2³ = 117581501 is a prime.

It is a super-2 number, since 2×117581509² = 27650822517434162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117581501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58790754 + 58790755.

It is an arithmetic number, because the mean of its divisors is an integer number (58790755).

Almost surely, 2^117581509 is an apocalyptic number.

It is an amenable number.

117581509 is a deficient number, since it is larger than the sum of its proper divisors (1).

117581509 is an equidigital number, since it uses as much as digits as its factorization.

117581509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 117581509 is about 10843.5007723521. The cubic root of 117581509 is about 489.9062836182.

The spelling of 117581509 in words is "one hundred seventeen million, five hundred eighty-one thousand, five hundred nine".