25781197 has 8 divisors (see below), whose sum is σ = 29397816. Its totient is φ = 22397952.

The previous prime is 25781177. The next prime is 25781207. The reversal of 25781197 is 79118752.

It can be written as a sum of positive squares in 4 ways, for example, as 35721 + 25745476 = 189^2 + 5074^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25781197 - 2⁷ = 25781069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25781117) 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 7 ways as a sum of consecutive naturals, for example, 58108 + ... + 58549.

It is an arithmetic number, because the mean of its divisors is an integer number (3674727).

Almost surely, 2^25781197 is an apocalyptic number.

It is an amenable number.

25781197 is a deficient number, since it is larger than the sum of its proper divisors (3616619).

25781197 is a wasteful number, since it uses less digits than its factorization.

25781197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116687.

The product of its digits is 35280, while the sum is 40.

The square root of 25781197 is about 5077.5187838156. The cubic root of 25781197 is about 295.4162351819.

The spelling of 25781197 in words is "twenty-five million, seven hundred eighty-one thousand, one hundred ninety-seven".