26551621 has 4 divisors (see below), whose sum is σ = 26572000. Its totient is φ = 26531244.

The previous prime is 26551619. The next prime is 26551627. The reversal of 26551621 is 12615562.

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.

It is a cyclic number.

It is not a de Polignac number, because 26551621 - 2¹ = 26551619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26551621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26551627) 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, 8091 + ... + 10888.

It is an arithmetic number, because the mean of its divisors is an integer number (6643000).

Almost surely, 2^26551621 is an apocalyptic number.

It is an amenable number.

26551621 is a deficient number, since it is larger than the sum of its proper divisors (20379).

26551621 is a wasteful number, since it uses less digits than its factorization.

26551621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20378.

The product of its digits is 3600, while the sum is 28.

The square root of 26551621 is about 5152.8265059092. The cubic root of 26551621 is about 298.3300586042.

It can be divided in two parts, 26551 and 621, that added together give a palindrome (27172).

The spelling of 26551621 in words is "twenty-six million, five hundred fifty-one thousand, six hundred twenty-one".