4991143 has 2 divisors, whose sum is σ = 4991144. Its totient is φ = 4991142.

The previous prime is 4991137. The next prime is 4991153. The reversal of 4991143 is 3411994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4991143 - 2⁹ = 4990631 is a prime.

4991143 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4991123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495571 + 2495572.

It is an arithmetic number, because the mean of its divisors is an integer number (2495572).

Almost surely, 2^4991143 is an apocalyptic number.

4991143 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991143 is an equidigital number, since it uses as much as digits as its factorization.

4991143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 4991143 is about 2234.0866142565. The cubic root of 4991143 is about 170.8965666107.

The spelling of 4991143 in words is "four million, nine hundred ninety-one thousand, one hundred forty-three".