25494191 has 2 divisors, whose sum is σ = 25494192. Its totient is φ = 25494190.

The previous prime is 25494179. The next prime is 25494199. The reversal of 25494191 is 19149452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25494191 - 2⁶ = 25494127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25494199) 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, 12747095 + 12747096.

It is an arithmetic number, because the mean of its divisors is an integer number (12747096).

Almost surely, 2^25494191 is an apocalyptic number.

25494191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25494191 is an equidigital number, since it uses as much as digits as its factorization.

25494191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 25494191 is about 5049.1772597127. The cubic root of 25494191 is about 294.3159136764.

The spelling of 25494191 in words is "twenty-five million, four hundred ninety-four thousand, one hundred ninety-one".