25911601 has 4 divisors (see below), whose sum is σ = 26046052. Its totient is φ = 25777152.

The previous prime is 25911583. The next prime is 25911619. The reversal of 25911601 is 10611952.

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

It is an interprime number because it is at equal distance from previous prime (25911583) and next prime (25911619).

It can be written as a sum of positive squares in 2 ways, for example, as 2640625 + 23270976 = 1625^2 + 4824^2 .

It is a cyclic number.

It is not a de Polignac number, because 25911601 - 2¹⁷ = 25780529 is a prime.

It is a super-2 number, since 2×25911601² = 1342822132766402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25911001) 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, 66936 + ... + 67321.

It is an arithmetic number, because the mean of its divisors is an integer number (6511513).

Almost surely, 2^25911601 is an apocalyptic number.

It is an amenable number.

25911601 is a deficient number, since it is larger than the sum of its proper divisors (134451).

25911601 is a wasteful number, since it uses less digits than its factorization.

25911601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134450.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 25911601 is about 5090.3438980092. The cubic root of 25911601 is about 295.9134798565.

The spelling of 25911601 in words is "twenty-five million, nine hundred eleven thousand, six hundred one".