25991701 has 4 divisors (see below), whose sum is σ = 26001900. Its totient is φ = 25981504.

The previous prime is 25991689. The next prime is 25991717. The reversal of 25991701 is 10719952.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16597476 + 9394225 = 4074^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 25991701 - 2¹¹ = 25989653 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 (25991101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2415 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (6500475).

Almost surely, 2^25991701 is an apocalyptic number.

It is an amenable number.

25991701 is a deficient number, since it is larger than the sum of its proper divisors (10199).

25991701 is an equidigital number, since it uses as much as digits as its factorization.

25991701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10198.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 25991701 is about 5098.2056647413. The cubic root of 25991701 is about 296.2180832879.

The spelling of 25991701 in words is "twenty-five million, nine hundred ninety-one thousand, seven hundred one".