4991923 has 2 divisors, whose sum is σ = 4991924. Its totient is φ = 4991922.

The previous prime is 4991893. The next prime is 4991933. The reversal of 4991923 is 3291994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4991923 - 2¹³ = 4983731 is a prime.

It is not a weakly prime, because it can be changed into another prime (4991933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495961 + 2495962.

It is an arithmetic number, because the mean of its divisors is an integer number (2495962).

Almost surely, 2^4991923 is an apocalyptic number.

4991923 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991923 is an equidigital number, since it uses as much as digits as its factorization.

4991923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 4991923 is about 2234.2611754224. The cubic root of 4991923 is about 170.9054685382.

The spelling of 4991923 in words is "four million, nine hundred ninety-one thousand, nine hundred twenty-three".