26815121 has 4 divisors (see below), whose sum is σ = 27539892. Its totient is φ = 26090352.

The previous prime is 26815109. The next prime is 26815141. The reversal of 26815121 is 12151862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12151862 = 2 ⋅6075931.

It can be written as a sum of positive squares in 2 ways, for example, as 22657600 + 4157521 = 4760^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 26815121 - 2⁶ = 26815057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26815141) 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, 362330 + ... + 362403.

It is an arithmetic number, because the mean of its divisors is an integer number (6884973).

Almost surely, 2^26815121 is an apocalyptic number.

It is an amenable number.

26815121 is a deficient number, since it is larger than the sum of its proper divisors (724771).

26815121 is an equidigital number, since it uses as much as digits as its factorization.

26815121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724770.

The product of its digits is 960, while the sum is 26.

The square root of 26815121 is about 5178.3318742622. The cubic root of 26815121 is about 299.3136941076.

Adding to 26815121 its reverse (12151862), we get a palindrome (38966983).

The spelling of 26815121 in words is "twenty-six million, eight hundred fifteen thousand, one hundred twenty-one".