26889581 has 2 divisors, whose sum is σ = 26889582. Its totient is φ = 26889580.

The previous prime is 26889571. The next prime is 26889587. The reversal of 26889581 is 18598862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 4884100 = 4691^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 26889581 - 2¹⁸ = 26627437 is a prime.

It is a super-2 number, since 2×26889581² = 1446099132711122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26889587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13444790 + 13444791.

It is an arithmetic number, because the mean of its divisors is an integer number (13444791).

Almost surely, 2^26889581 is an apocalyptic number.

It is an amenable number.

26889581 is a deficient number, since it is larger than the sum of its proper divisors (1).

26889581 is an equidigital number, since it uses as much as digits as its factorization.

26889581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The square root of 26889581 is about 5185.5164641528. The cubic root of 26889581 is about 299.5904819784.

The spelling of 26889581 in words is "twenty-six million, eight hundred eighty-nine thousand, five hundred eighty-one".