381361181 has 2 divisors, whose sum is σ = 381361182. Its totient is φ = 381361180.

The previous prime is 381361177. The next prime is 381361219. The reversal of 381361181 is 181163183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336135556 + 45225625 = 18334^2 + 6725^2 .

It is a cyclic number.

It is not a de Polignac number, because 381361181 - 2² = 381361177 is a prime.

It is a super-2 number, since 2×381361181² = 290872700747429522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381361121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190680590 + 190680591.

It is an arithmetic number, because the mean of its divisors is an integer number (190680591).

Almost surely, 2^381361181 is an apocalyptic number.

It is an amenable number.

381361181 is a deficient number, since it is larger than the sum of its proper divisors (1).

381361181 is an equidigital number, since it uses as much as digits as its factorization.

381361181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 381361181 is about 19528.4710359004. The cubic root of 381361181 is about 725.1794599740.

The spelling of 381361181 in words is "three hundred eighty-one million, three hundred sixty-one thousand, one hundred eighty-one".