994890181 has 2 divisors, whose sum is σ = 994890182. Its totient is φ = 994890180.

The previous prime is 994890157. The next prime is 994890191. The reversal of 994890181 is 181098499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994393156 + 497025 = 31534^2 + 705^2 .

It is a cyclic number.

It is not a de Polignac number, because 994890181 - 2¹⁷ = 994759109 is a prime.

It is a super-2 number, since 2×994890181² = 1979612944500425522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994890121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497445090 + 497445091.

It is an arithmetic number, because the mean of its divisors is an integer number (497445091).

Almost surely, 2^994890181 is an apocalyptic number.

It is an amenable number.

994890181 is a deficient number, since it is larger than the sum of its proper divisors (1).

994890181 is an equidigital number, since it uses as much as digits as its factorization.

994890181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 994890181 is about 31541.8797949647. The cubic root of 994890181 is about 998.2938175972.

The spelling of 994890181 in words is "nine hundred ninety-four million, eight hundred ninety thousand, one hundred eighty-one".