25193891 has 2 divisors, whose sum is σ = 25193892. Its totient is φ = 25193890.

The previous prime is 25193873. The next prime is 25193911. The reversal of 25193891 is 19839152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25193891 - 2⁶ = 25193827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25193801) 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, 12596945 + 12596946.

It is an arithmetic number, because the mean of its divisors is an integer number (12596946).

Almost surely, 2^25193891 is an apocalyptic number.

25193891 is a deficient number, since it is larger than the sum of its proper divisors (1).

25193891 is an equidigital number, since it uses as much as digits as its factorization.

25193891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 25193891 is about 5019.3516513590. The cubic root of 25193891 is about 293.1557489455.

The spelling of 25193891 in words is "twenty-five million, one hundred ninety-three thousand, eight hundred ninety-one".