25000009 has 2 divisors, whose sum is σ = 25000010. Its totient is φ = 25000008.

The previous prime is 24999983. The next prime is 25000033. The reversal of 25000009 is 90000052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 9 = 5000^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 25000009 - 2¹¹ = 24997961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 24999956 and 25000001.

It is not a weakly prime, because it can be changed into another prime (25000069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500004 + 12500005.

It is an arithmetic number, because the mean of its divisors is an integer number (12500005).

Almost surely, 2^25000009 is an apocalyptic number.

It is an amenable number.

25000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25000009 is an equidigital number, since it uses as much as digits as its factorization.

25000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 25000009 is about 5000.0008999999. Note that the first 3 decimals coincide. The cubic root of 25000009 is about 292.4018089095.

The spelling of 25000009 in words is "twenty-five million, nine", and thus it is an aban number and an uban number.