25643901 has 16 divisors (see below), whose sum is σ = 36872640. Its totient is φ = 15799680.

The previous prime is 25643897. The next prime is 25643903. The reversal of 25643901 is 10934652.

It is not a de Polignac number, because 25643901 - 2² = 25643897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3150 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (2304540).

Almost surely, 2^25643901 is an apocalyptic number.

It is an amenable number.

25643901 is a deficient number, since it is larger than the sum of its proper divisors (11228739).

25643901 is a wasteful number, since it uses less digits than its factorization.

25643901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11036.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 25643901 is about 5063.9807464089. The cubic root of 25643901 is about 294.8908952078.

The spelling of 25643901 in words is "twenty-five million, six hundred forty-three thousand, nine hundred one".