4991849 has 2 divisors, whose sum is σ = 4991850. Its totient is φ = 4991848.

The previous prime is 4991843. The next prime is 4991867. The reversal of 4991849 is 9481994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2941225 + 2050624 = 1715^2 + 1432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991849 is a prime.

It is not a weakly prime, because it can be changed into another prime (4991843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495924 + 2495925.

It is an arithmetic number, because the mean of its divisors is an integer number (2495925).

Almost surely, 2^4991849 is an apocalyptic number.

It is an amenable number.

4991849 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991849 is an equidigital number, since it uses as much as digits as its factorization.

4991849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 4991849 is about 2234.2446150769. The cubic root of 4991849 is about 170.9046240362.

The spelling of 4991849 in words is "four million, nine hundred ninety-one thousand, eight hundred forty-nine".