26243561 has 4 divisors (see below), whose sum is σ = 26379732. Its totient is φ = 26107392.

The previous prime is 26243557. The next prime is 26243587. The reversal of 26243561 is 16534262.

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 15642025 + 10601536 = 3955^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 26243561 - 2² = 26243557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26243551) 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, 67796 + ... + 68181.

It is an arithmetic number, because the mean of its divisors is an integer number (6594933).

Almost surely, 2^26243561 is an apocalyptic number.

It is an amenable number.

26243561 is a deficient number, since it is larger than the sum of its proper divisors (136171).

26243561 is a wasteful number, since it uses less digits than its factorization.

26243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136170.

The product of its digits is 8640, while the sum is 29.

The square root of 26243561 is about 5122.8469623833. The cubic root of 26243561 is about 297.1717953885.

The spelling of 26243561 in words is "twenty-six million, two hundred forty-three thousand, five hundred sixty-one".