25209013 has 2 divisors, whose sum is σ = 25209014. Its totient is φ = 25209012.

The previous prime is 25209001. The next prime is 25209049. The reversal of 25209013 is 31090252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 8749764 = 4057^2 + 2958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25209013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25209053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604506 + 12604507.

It is an arithmetic number, because the mean of its divisors is an integer number (12604507).

Almost surely, 2^25209013 is an apocalyptic number.

It is an amenable number.

25209013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25209013 is an equidigital number, since it uses as much as digits as its factorization.

25209013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 25209013 is about 5020.8577952378. The cubic root of 25209013 is about 293.2143903384.

Adding to 25209013 its reverse (31090252), we get a palindrome (56299265).

The spelling of 25209013 in words is "twenty-five million, two hundred nine thousand, thirteen".