25502009 has 24 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 21013344.

The previous prime is 25501997. The next prime is 25502027. The reversal of 25502009 is 90020552.

25502009 = 130² + 131² + ... + 428².

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-25502009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25502909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 380594 + ... + 380660.

It is an arithmetic number, because the mean of its divisors is an integer number (1275960).

Almost surely, 2^25502009 is an apocalyptic number.

It is an amenable number.

25502009 is a deficient number, since it is larger than the sum of its proper divisors (5121031).

25502009 is a wasteful number, since it uses less digits than its factorization.

25502009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 25502009 is about 5049.9513859046. The cubic root of 25502009 is about 294.3459953873.

The spelling of 25502009 in words is "twenty-five million, five hundred two thousand, nine".