181317413 has 2 divisors, whose sum is σ = 181317414. Its totient is φ = 181317412.

The previous prime is 181317407. The next prime is 181317491. The reversal of 181317413 is 314713181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95902849 + 85414564 = 9793^2 + 9242^2 .

It is a cyclic number.

It is not a de Polignac number, because 181317413 - 2¹⁰ = 181316389 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 (181317313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90658706 + 90658707.

It is an arithmetic number, because the mean of its divisors is an integer number (90658707).

Almost surely, 2^181317413 is an apocalyptic number.

It is an amenable number.

181317413 is a deficient number, since it is larger than the sum of its proper divisors (1).

181317413 is an equidigital number, since it uses as much as digits as its factorization.

181317413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 181317413 is about 13465.4154410475. The cubic root of 181317413 is about 565.9957515695.

The spelling of 181317413 in words is "one hundred eighty-one million, three hundred seventeen thousand, four hundred thirteen".