2491243 has 2 divisors, whose sum is σ = 2491244. Its totient is φ = 2491242.

The previous prime is 2491211. The next prime is 2491259. The reversal of 2491243 is 3421942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2491243 - 2⁵ = 2491211 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁷ + 4³ + 9² + 1 + 2²¹ + 4⁹ + 3⁶ .

It is not a weakly prime, because it can be changed into another prime (2491043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245621 + 1245622.

It is an arithmetic number, because the mean of its divisors is an integer number (1245622).

2^2491243 is an apocalyptic number.

2491243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491243 is an equidigital number, since it uses as much as digits as its factorization.

2491243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 2491243 is about 1578.3671942866. The cubic root of 2491243 is about 135.5622277415.

The spelling of 2491243 in words is "two million, four hundred ninety-one thousand, two hundred forty-three".