25073281 has 4 divisors (see below), whose sum is σ = 25095492. Its totient is φ = 25051072.

The previous prime is 25073267. The next prime is 25073287. The reversal of 25073281 is 18237052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4060225 + 21013056 = 2015^2 + 4584^2 .

It is a cyclic number.

It is not a de Polignac number, because 25073281 - 2¹⁷ = 24942209 is a prime.

It is a super-2 number, since 2×25073281² = 1257338840209922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25073287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9316 + ... + 11701.

It is an arithmetic number, because the mean of its divisors is an integer number (6273873).

Almost surely, 2^25073281 is an apocalyptic number.

It is an amenable number.

25073281 is a deficient number, since it is larger than the sum of its proper divisors (22211).

25073281 is a wasteful number, since it uses less digits than its factorization.

25073281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22210.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 25073281 is about 5007.3227377512. The cubic root of 25073281 is about 292.6871950485.

The spelling of 25073281 in words is "twenty-five million, seventy-three thousand, two hundred eighty-one".