4991123 has 2 divisors, whose sum is σ = 4991124. Its totient is φ = 4991122.

The previous prime is 4991101. The next prime is 4991131. The reversal of 4991123 is 3211994.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4991123 - 2¹² = 4987027 is a prime.

It is a super-2 number, since 2×4991123² = 49822617602258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4991143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495561 + 2495562.

It is an arithmetic number, because the mean of its divisors is an integer number (2495562).

Almost surely, 2^4991123 is an apocalyptic number.

4991123 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991123 is an equidigital number, since it uses as much as digits as its factorization.

4991123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 4991123 is about 2234.0821381498. The cubic root of 4991123 is about 170.8963383440.

The spelling of 4991123 in words is "four million, nine hundred ninety-one thousand, one hundred twenty-three".