25209071 has 2 divisors, whose sum is σ = 25209072. Its totient is φ = 25209070.

The previous prime is 25209053. The next prime is 25209083. The reversal of 25209071 is 17090252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25209071 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25209071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25209001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604535 + 12604536.

It is an arithmetic number, because the mean of its divisors is an integer number (12604536).

Almost surely, 2^25209071 is an apocalyptic number.

25209071 is a deficient number, since it is larger than the sum of its proper divisors (1).

25209071 is an equidigital number, since it uses as much as digits as its factorization.

25209071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 25209071 is about 5020.8635711399. The cubic root of 25209071 is about 293.2146152106.

The spelling of 25209071 in words is "twenty-five million, two hundred nine thousand, seventy-one".