25194009 has 4 divisors (see below), whose sum is σ = 33592016. Its totient is φ = 16796004.

The previous prime is 25194007. The next prime is 25194023. The reversal of 25194009 is 90049152.

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 not a de Polignac number, because 25194009 - 2¹ = 25194007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25194007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4198999 + ... + 4199004.

It is an arithmetic number, because the mean of its divisors is an integer number (8398004).

Almost surely, 2^25194009 is an apocalyptic number.

It is an amenable number.

25194009 is a deficient number, since it is larger than the sum of its proper divisors (8398007).

25194009 is an equidigital number, since it uses as much as digits as its factorization.

25194009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398006.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 25194009 is about 5019.3634058514. The cubic root of 25194009 is about 293.1562066269.

The spelling of 25194009 in words is "twenty-five million, one hundred ninety-four thousand, nine".