994991 has 2 divisors, whose sum is σ = 994992. Its totient is φ = 994990.

The previous prime is 994963. The next prime is 994997. The reversal of 994991 is 199499.

It is a strong prime.

It is an emirp because it is prime and its reverse (199499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994991 - 2⁶ = 994927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497495 + 497496.

It is an arithmetic number, because the mean of its divisors is an integer number (497496).

2⁹⁹⁴⁹⁹¹ is an apocalyptic number.

994991 is a deficient number, since it is larger than the sum of its proper divisors (1).

994991 is an equidigital number, since it uses as much as digits as its factorization.

994991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 41.

The square root of 994991 is about 997.4923558604. The cubic root of 994991 is about 99.8327537763.

The spelling of 994991 in words is "nine hundred ninety-four thousand, nine hundred ninety-one".