25209281 has 2 divisors, whose sum is σ = 25209282. Its totient is φ = 25209280.

The previous prime is 25209277. The next prime is 25209319. The reversal of 25209281 is 18290252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 6330256 = 4345^2 + 2516^2 .

It is a cyclic number.

It is not a de Polignac number, because 25209281 - 2² = 25209277 is a prime.

It is a super-2 number, since 2×25209281² = 1271015697073922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25209211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604640 + 12604641.

It is an arithmetic number, because the mean of its divisors is an integer number (12604641).

Almost surely, 2^25209281 is an apocalyptic number.

It is an amenable number.

25209281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25209281 is an equidigital number, since it uses as much as digits as its factorization.

25209281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 25209281 is about 5020.8844838335. The cubic root of 25209281 is about 293.2154294003.

The spelling of 25209281 in words is "twenty-five million, two hundred nine thousand, two hundred eighty-one".