25783261 has 6 divisors (see below), whose sum is σ = 29992830. Its totient is φ = 22099896.

The previous prime is 25783259. The next prime is 25783327. The reversal of 25783261 is 16238752.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25190361 + 592900 = 5019^2 + 770^2 .

It is not a de Polignac number, because 25783261 - 2¹ = 25783259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25783201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263046 + ... + 263143.

It is an arithmetic number, because the mean of its divisors is an integer number (4998805).

Almost surely, 2^25783261 is an apocalyptic number.

It is an amenable number.

25783261 is a deficient number, since it is larger than the sum of its proper divisors (4209569).

25783261 is an equidigital number, since it uses as much as digits as its factorization.

25783261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526203 (or 526196 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 25783261 is about 5077.7220286266. The cubic root of 25783261 is about 295.4241184833.

The spelling of 25783261 in words is "twenty-five million, seven hundred eighty-three thousand, two hundred sixty-one".