25540891 has 4 divisors (see below), whose sum is σ = 25551000. Its totient is φ = 25530784.

The previous prime is 25540877. The next prime is 25540897. The reversal of 25540891 is 19804552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25540891 - 2⁷ = 25540763 is a prime.

It is a super-2 number, since 2×25540891² = 1304674226147762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25540897) 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 in 3 ways as a sum of consecutive naturals, for example, 2460 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (6387750).

Almost surely, 2^25540891 is an apocalyptic number.

25540891 is a deficient number, since it is larger than the sum of its proper divisors (10109).

25540891 is an equidigital number, since it uses as much as digits as its factorization.

25540891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 25540891 is about 5053.7996596620. The cubic root of 25540891 is about 294.4955123586.

The spelling of 25540891 in words is "twenty-five million, five hundred forty thousand, eight hundred ninety-one".