26825561 has 4 divisors (see below), whose sum is σ = 30657792. Its totient is φ = 22993332.

The previous prime is 26825531. The next prime is 26825563. The reversal of 26825561 is 16552862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16552862 = 2 ⋅8276431.

It is a cyclic number.

It is not a de Polignac number, because 26825561 - 2⁶ = 26825497 is a prime.

It is a super-2 number, since 2×26825561² = 1439221445929442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26825563) 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, 1916105 + ... + 1916118.

It is an arithmetic number, because the mean of its divisors is an integer number (7664448).

Almost surely, 2^26825561 is an apocalyptic number.

It is an amenable number.

26825561 is a deficient number, since it is larger than the sum of its proper divisors (3832231).

26825561 is an equidigital number, since it uses as much as digits as its factorization.

26825561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832230.

The product of its digits is 28800, while the sum is 35.

The square root of 26825561 is about 5179.3398227960. The cubic root of 26825561 is about 299.3525332576.

The spelling of 26825561 in words is "twenty-six million, eight hundred twenty-five thousand, five hundred sixty-one".