26553409 has 3 divisors (see below), whose sum is σ = 26558563. Its totient is φ = 26548256.

The previous prime is 26553407. The next prime is 26553413. The reversal of 26553409 is 90435562.

The square root of 26553409 is 5153.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 16769025 + 9784384 = 4095^2 + 3128^2 .

It is not a de Polignac number, because 26553409 - 2¹ = 26553407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26553407) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2577 + ... + 7729.

Almost surely, 2^26553409 is an apocalyptic number.

26553409 is the 5153-rd square number.

26553409 is the 2577-th centered octagonal number.

It is an amenable number.

26553409 is a deficient number, since it is larger than the sum of its proper divisors (5154).

26553409 is an frugal number, since it uses more digits than its factorization.

26553409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306 (or 5153 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The cubic root of 26553409 is about 298.3367550211.

Multiplying 26553409 by its product of nonzero digits (32400), we get a square (860330451600 = 927540²).

It can be divided in two parts, 26553 and 409, that added together give a palindrome (26962).

The spelling of 26553409 in words is "twenty-six million, five hundred fifty-three thousand, four hundred nine".