4991843 has 2 divisors, whose sum is σ = 4991844. Its totient is φ = 4991842.

The previous prime is 4991839. The next prime is 4991849. The reversal of 4991843 is 3481994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4991843 - 2² = 4991839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4991797 and 4991806.

It is not a weakly prime, because it can be changed into another prime (4991849) 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, 2495921 + 2495922.

It is an arithmetic number, because the mean of its divisors is an integer number (2495922).

Almost surely, 2^4991843 is an apocalyptic number.

4991843 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991843 is an equidigital number, since it uses as much as digits as its factorization.

4991843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 4991843 is about 2234.2432723408. The cubic root of 4991843 is about 170.9045555627.

The spelling of 4991843 in words is "four million, nine hundred ninety-one thousand, eight hundred forty-three".