25909201 has 16 divisors (see below), whose sum is σ = 28033920. Its totient is φ = 23886720.

The previous prime is 25909189. The next prime is 25909223. The reversal of 25909201 is 10290952.

25909201 = T₄₃₈ + T₄₃₉ + ... + T₆₂₀.

25909201 is a nontrivial binomial coefficient, being equal to C(7199, 2).

It is a cyclic number.

It is not a de Polignac number, because 25909201 - 2⁷ = 25909073 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 25909201.

It is not an unprimeable number, because it can be changed into a prime (25909231) 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, 82621 + ... + 82933.

It is an arithmetic number, because the mean of its divisors is an integer number (1752120).

Almost surely, 2^25909201 is an apocalyptic number.

25909201 is the 7198-th triangular number.

25909201 is the 2400-th centered nonagonal number.

It is an amenable number.

25909201 is a deficient number, since it is larger than the sum of its proper divisors (2124719).

25909201 is a wasteful number, since it uses less digits than its factorization.

25909201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 25909201 is about 5090.1081520926. The cubic root of 25909201 is about 295.9043434819.

It can be divided in two parts, 25 and 909201, that added together give a triangular number (909226 = T₁₃₄₈).

The spelling of 25909201 in words is "twenty-five million, nine hundred nine thousand, two hundred one".