2421491 has 2 divisors, whose sum is σ = 2421492. Its totient is φ = 2421490.

The previous prime is 2421473. The next prime is 2421511. The reversal of 2421491 is 1941242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2421491 - 2¹⁴ = 2405107 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2421421) 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, 1210745 + 1210746.

It is an arithmetic number, because the mean of its divisors is an integer number (1210746).

2^2421491 is an apocalyptic number.

2421491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421491 is an equidigital number, since it uses as much as digits as its factorization.

2421491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 2421491 is about 1556.1140703689. The cubic root of 2421491 is about 134.2850359426.

Subtracting from 2421491 its reverse (1941242), we obtain a square (480249 = 693²).

The spelling of 2421491 in words is "two million, four hundred twenty-one thousand, four hundred ninety-one".