2491903 has 2 divisors, whose sum is σ = 2491904. Its totient is φ = 2491902.

The previous prime is 2491891. The next prime is 2491933. The reversal of 2491903 is 3091942.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2491903 - 2⁵ = 2491871 is a prime.

It is a super-2 number, since 2×2491903² = 12419161122818, which contains 22 as substring.

2491903 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245951 + 1245952.

It is an arithmetic number, because the mean of its divisors is an integer number (1245952).

2^2491903 is an apocalyptic number.

2491903 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491903 is an equidigital number, since it uses as much as digits as its factorization.

2491903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 2491903 is about 1578.5762572648. The cubic root of 2491903 is about 135.5741980940.

The spelling of 2491903 in words is "two million, four hundred ninety-one thousand, nine hundred three".