25091491 has 4 divisors (see below), whose sum is σ = 25182352. Its totient is φ = 25000632.

The previous prime is 25091483. The next prime is 25091497. The reversal of 25091491 is 19419052.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25091491 - 2³ = 25091483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25091497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45015 + ... + 45568.

It is an arithmetic number, because the mean of its divisors is an integer number (6295588).

Almost surely, 2^25091491 is an apocalyptic number.

25091491 is a deficient number, since it is larger than the sum of its proper divisors (90861).

25091491 is an equidigital number, since it uses as much as digits as its factorization.

25091491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90860.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 25091491 is about 5009.1407446787. The cubic root of 25091491 is about 292.7580346545.

The spelling of 25091491 in words is "twenty-five million, ninety-one thousand, four hundred ninety-one".