25516009 has 2 divisors, whose sum is σ = 25516010. Its totient is φ = 25516008.

The previous prime is 25516003. The next prime is 25516013. The reversal of 25516009 is 90061552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25280784 + 235225 = 5028^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 25516009 - 2¹³ = 25507817 is a prime.

It is a super-3 number, since 3×25516009³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25516003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758004 + 12758005.

It is an arithmetic number, because the mean of its divisors is an integer number (12758005).

Almost surely, 2^25516009 is an apocalyptic number.

It is an amenable number.

25516009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25516009 is an equidigital number, since it uses as much as digits as its factorization.

25516009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 25516009 is about 5051.3373476734. The cubic root of 25516009 is about 294.3998485312.

The spelling of 25516009 in words is "twenty-five million, five hundred sixteen thousand, nine".