25391243 has 2 divisors, whose sum is σ = 25391244. Its totient is φ = 25391242.

The previous prime is 25391231. The next prime is 25391297. The reversal of 25391243 is 34219352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25391243 - 2⁴ = 25391227 is a prime.

It is not a weakly prime, because it can be changed into another prime (25391843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695621 + 12695622.

It is an arithmetic number, because the mean of its divisors is an integer number (12695622).

Almost surely, 2^25391243 is an apocalyptic number.

25391243 is a deficient number, since it is larger than the sum of its proper divisors (1).

25391243 is an equidigital number, since it uses as much as digits as its factorization.

25391243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 25391243 is about 5038.9724150862. The cubic root of 25391243 is about 293.9192205609.

The spelling of 25391243 in words is "twenty-five million, three hundred ninety-one thousand, two hundred forty-three".