4990891 has 2 divisors, whose sum is σ = 4990892. Its totient is φ = 4990890.

The previous prime is 4990849. The next prime is 4990919. The reversal of 4990891 is 1980994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4990891 - 2¹¹ = 4988843 is a prime.

It is not a weakly prime, because it can be changed into another prime (4990831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495445 + 2495446.

It is an arithmetic number, because the mean of its divisors is an integer number (2495446).

Almost surely, 2^4990891 is an apocalyptic number.

4990891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4990891 is an equidigital number, since it uses as much as digits as its factorization.

4990891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 4990891 is about 2234.0302146569. The cubic root of 4990891 is about 170.8936904052.

The spelling of 4990891 in words is "four million, nine hundred ninety thousand, eight hundred ninety-one".