4991983 has 2 divisors, whose sum is σ = 4991984. Its totient is φ = 4991982.

The previous prime is 4991977. The next prime is 4992007. The reversal of 4991983 is 3891994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4991983 - 2⁵ = 4991951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4991923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495991 + 2495992.

It is an arithmetic number, because the mean of its divisors is an integer number (2495992).

Almost surely, 2^4991983 is an apocalyptic number.

4991983 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991983 is an equidigital number, since it uses as much as digits as its factorization.

4991983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 4991983 is about 2234.2746026395. The cubic root of 4991983 is about 170.9061532634.

The spelling of 4991983 in words is "four million, nine hundred ninety-one thousand, nine hundred eighty-three".