25148209 has 2 divisors, whose sum is σ = 25148210. Its totient is φ = 25148208.

The previous prime is 25148203. The next prime is 25148213. The reversal of 25148209 is 90284152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 6615184 = 4305^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 25148209 - 2²¹ = 23051057 is a prime.

It is equal to p_1574644 and since 25148209 and 1574644 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25148203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12574104 + 12574105.

It is an arithmetic number, because the mean of its divisors is an integer number (12574105).

Almost surely, 2^25148209 is an apocalyptic number.

It is an amenable number.

25148209 is a deficient number, since it is larger than the sum of its proper divisors (1).

25148209 is an equidigital number, since it uses as much as digits as its factorization.

25148209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 25148209 is about 5014.7989989630. The cubic root of 25148209 is about 292.9784567169.

The spelling of 25148209 in words is "twenty-five million, one hundred forty-eight thousand, two hundred nine".