25549997 has 12 divisors (see below), whose sum is σ = 29738268. Its totient is φ = 21859200.

The previous prime is 25549991. The next prime is 25550027. The reversal of 25549997 is 79994552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22791076 + 2758921 = 4774^2 + 1661^2 .

It is not a de Polignac number, because 25549997 - 2⁶ = 25549933 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 (25549991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4154 + ... + 8267.

It is an arithmetic number, because the mean of its divisors is an integer number (2478189).

Almost surely, 2^25549997 is an apocalyptic number.

It is an amenable number.

25549997 is a deficient number, since it is larger than the sum of its proper divisors (4188271).

25549997 is a wasteful number, since it uses less digits than its factorization.

25549997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12460 (or 12449 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 50.

The square root of 25549997 is about 5054.7004856866. The cubic root of 25549997 is about 294.5305066677.

The spelling of 25549997 in words is "twenty-five million, five hundred forty-nine thousand, nine hundred ninety-seven".