181057117 has 2 divisors, whose sum is σ = 181057118. Its totient is φ = 181057116.

The previous prime is 181057109. The next prime is 181057139. The reversal of 181057117 is 711750181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176066361 + 4990756 = 13269^2 + 2234^2 .

It is an emirp because it is prime and its reverse (711750181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181057117 - 2³ = 181057109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181057187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90528558 + 90528559.

It is an arithmetic number, because the mean of its divisors is an integer number (90528559).

Almost surely, 2^181057117 is an apocalyptic number.

It is an amenable number.

181057117 is a deficient number, since it is larger than the sum of its proper divisors (1).

181057117 is an equidigital number, since it uses as much as digits as its factorization.

181057117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 31.

The square root of 181057117 is about 13455.7466162231. The cubic root of 181057117 is about 565.7247774368.

The spelling of 181057117 in words is "one hundred eighty-one million, fifty-seven thousand, one hundred seventeen".