25981901 has 4 divisors (see below), whose sum is σ = 28343904. Its totient is φ = 23619900.

The previous prime is 25981897. The next prime is 25981909. The reversal of 25981901 is 10918952.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25981901 - 2² = 25981897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25981909) 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, 1180985 + ... + 1181006.

It is an arithmetic number, because the mean of its divisors is an integer number (7085976).

Almost surely, 2^25981901 is an apocalyptic number.

It is an amenable number.

25981901 is a deficient number, since it is larger than the sum of its proper divisors (2362003).

25981901 is a wasteful number, since it uses less digits than its factorization.

25981901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362002.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 25981901 is about 5097.2444516621. The cubic root of 25981901 is about 296.1808495809.

The spelling of 25981901 in words is "twenty-five million, nine hundred eighty-one thousand, nine hundred one".