25901861 has 4 divisors (see below), whose sum is σ = 25912224. Its totient is φ = 25891500.

The previous prime is 25901857. The next prime is 25901879. The reversal of 25901861 is 16810952.

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, 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 25901861 - 2² = 25901857 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 (25901831) 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, 1136 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (6478056).

Almost surely, 2^25901861 is an apocalyptic number.

It is an amenable number.

25901861 is a deficient number, since it is larger than the sum of its proper divisors (10363).

25901861 is an equidigital number, since it uses as much as digits as its factorization.

25901861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10362.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 25901861 is about 5089.3870947296. The cubic root of 25901861 is about 295.8763979010.

Subtracting from 25901861 its reverse (16810952), we obtain a palindrome (9090909).

It can be divided in two parts, 25901 and 861, that added together give a palindrome (26762).

The spelling of 25901861 in words is "twenty-five million, nine hundred one thousand, eight hundred sixty-one".