994890191 has 2 divisors, whose sum is σ = 994890192. Its totient is φ = 994890190.

The previous prime is 994890181. The next prime is 994890199. The reversal of 994890191 is 191098499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 994890191 - 2²² = 990695887 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994890199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497445095 + 497445096.

It is an arithmetic number, because the mean of its divisors is an integer number (497445096).

Almost surely, 2^994890191 is an apocalyptic number.

994890191 is a deficient number, since it is larger than the sum of its proper divisors (1).

994890191 is an equidigital number, since it uses as much as digits as its factorization.

994890191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 994890191 is about 31541.8799534841. The cubic root of 994890191 is about 998.2938209419.

The spelling of 994890191 in words is "nine hundred ninety-four million, eight hundred ninety thousand, one hundred ninety-one".