25209049 has 2 divisors, whose sum is σ = 25209050. Its totient is φ = 25209048.

The previous prime is 25209013. The next prime is 25209053. The reversal of 25209049 is 94090252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 8649 = 5020^2 + 93^2 .

It is a cyclic number.

It is not a de Polignac number, because 25209049 - 2⁹ = 25208537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25209049.

It is not a weakly prime, because it can be changed into another prime (25209749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604524 + 12604525.

It is an arithmetic number, because the mean of its divisors is an integer number (12604525).

Almost surely, 2^25209049 is an apocalyptic number.

It is an amenable number.

25209049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25209049 is an equidigital number, since it uses as much as digits as its factorization.

25209049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 25209049 is about 5020.8613802813. The cubic root of 25209049 is about 293.2145299143.

It can be divided in two parts, 25 and 209049, that multiplied together give a palindrome (5226225).

The spelling of 25209049 in words is "twenty-five million, two hundred nine thousand, forty-nine".