25642901 has 4 divisors (see below), whose sum is σ = 25720704. Its totient is φ = 25565100.

The previous prime is 25642891. The next prime is 25642909. The reversal of 25642901 is 10924652.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-25642901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642909) 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, 38405 + ... + 39066.

It is an arithmetic number, because the mean of its divisors is an integer number (6430176).

Almost surely, 2^25642901 is an apocalyptic number.

It is an amenable number.

25642901 is a deficient number, since it is larger than the sum of its proper divisors (77803).

25642901 is an equidigital number, since it uses as much as digits as its factorization.

25642901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77802.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 25642901 is about 5063.8820088940. The cubic root of 25642901 is about 294.8870620062.

The spelling of 25642901 in words is "twenty-five million, six hundred forty-two thousand, nine hundred one".