26821601 has 4 divisors (see below), whose sum is σ = 26873604. Its totient is φ = 26769600.

The previous prime is 26821547. The next prime is 26821643. The reversal of 26821601 is 10612862.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6885376 + 19936225 = 2624^2 + 4465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26821601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26821001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25220 + ... + 26261.

It is an arithmetic number, because the mean of its divisors is an integer number (6718401).

It is a Poulet number, since it divides 2^26821600-1.

Almost surely, 2^26821601 is an apocalyptic number.

It is an amenable number.

26821601 is a deficient number, since it is larger than the sum of its proper divisors (52003).

26821601 is an equidigital number, since it uses as much as digits as its factorization.

26821601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52002.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 26821601 is about 5178.9575205827. The cubic root of 26821601 is about 299.3378023527.

The spelling of 26821601 in words is "twenty-six million, eight hundred twenty-one thousand, six hundred one".