25001891 has 4 divisors (see below), whose sum is σ = 26317800. Its totient is φ = 23685984.

The previous prime is 25001881. The next prime is 25001953. The reversal of 25001891 is 19810052.

It is a happy number.

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 25001891 - 2⁶ = 25001827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25001891.

It is not an unprimeable number, because it can be changed into a prime (25001881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657926 + ... + 657963.

It is an arithmetic number, because the mean of its divisors is an integer number (6579450).

Almost surely, 2^25001891 is an apocalyptic number.

25001891 is a deficient number, since it is larger than the sum of its proper divisors (1315909).

25001891 is a wasteful number, since it uses less digits than its factorization.

25001891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315908.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 25001891 is about 5000.1890964243. The cubic root of 25001891 is about 292.4091460588.

The spelling of 25001891 in words is "twenty-five million, one thousand, eight hundred ninety-one".