26321561 has 8 divisors (see below), whose sum is σ = 30575424. Its totient is φ = 22191120.

The previous prime is 26321527. The next prime is 26321567. The reversal of 26321561 is 16512362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26321561 - 2¹⁰ = 26320537 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 26321561.

It is not an unprimeable number, because it can be changed into a prime (26321567) 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 7 ways as a sum of consecutive naturals, for example, 30395 + ... + 31248.

It is an arithmetic number, because the mean of its divisors is an integer number (3821928).

Almost surely, 2^26321561 is an apocalyptic number.

It is an amenable number.

26321561 is a deficient number, since it is larger than the sum of its proper divisors (4253863).

26321561 is an equidigital number, since it uses as much as digits as its factorization.

26321561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61711.

The product of its digits is 2160, while the sum is 26.

The square root of 26321561 is about 5130.4542683860. The cubic root of 26321561 is about 297.4659179938.

The spelling of 26321561 in words is "twenty-six million, three hundred twenty-one thousand, five hundred sixty-one".