25281409 has 2 divisors, whose sum is σ = 25281410. Its totient is φ = 25281408.

The previous prime is 25281407. The next prime is 25281413. The reversal of 25281409 is 90418252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25280784 + 625 = 5028^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 25281409 - 2¹ = 25281407 is a prime.

Together with 25281407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25281407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12640704 + 12640705.

It is an arithmetic number, because the mean of its divisors is an integer number (12640705).

Almost surely, 2^25281409 is an apocalyptic number.

It is an amenable number.

25281409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25281409 is an equidigital number, since it uses as much as digits as its factorization.

25281409 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 25281409 is about 5028.0621515650. The cubic root of 25281409 is about 293.4948093658.

The spelling of 25281409 in words is "twenty-five million, two hundred eighty-one thousand, four hundred nine".