361918181 has 2 divisors, whose sum is σ = 361918182. Its totient is φ = 361918180.

The previous prime is 361918177. The next prime is 361918217. The reversal of 361918181 is 181819163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201895681 + 160022500 = 14209^2 + 12650^2 .

It is a cyclic number.

It is not a de Polignac number, because 361918181 - 2² = 361918177 is a prime.

It is a super-2 number, since 2×361918181² = 261969539476697522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (361918171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180959090 + 180959091.

It is an arithmetic number, because the mean of its divisors is an integer number (180959091).

Almost surely, 2^361918181 is an apocalyptic number.

It is an amenable number.

361918181 is a deficient number, since it is larger than the sum of its proper divisors (1).

361918181 is an equidigital number, since it uses as much as digits as its factorization.

361918181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 38.

The square root of 361918181 is about 19024.1473133489. The cubic root of 361918181 is about 712.6398984963.

The spelling of 361918181 in words is "three hundred sixty-one million, nine hundred eighteen thousand, one hundred eighty-one".