26891189 has 4 divisors (see below), whose sum is σ = 28959756. Its totient is φ = 24822624.

The previous prime is 26891177. The next prime is 26891201. The reversal of 26891189 is 98119862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98119862 = 2 ⋅49059931.

It is an interprime number because it is at equal distance from previous prime (26891177) and next prime (26891201).

It can be written as a sum of positive squares in 2 ways, for example, as 2220100 + 24671089 = 1490^2 + 4967^2 .

It is a cyclic number.

It is not a de Polignac number, because 26891189 - 2¹² = 26887093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26891159) 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, 1034264 + ... + 1034289.

It is an arithmetic number, because the mean of its divisors is an integer number (7239939).

Almost surely, 2^26891189 is an apocalyptic number.

It is an amenable number.

26891189 is a deficient number, since it is larger than the sum of its proper divisors (2068567).

26891189 is a wasteful number, since it uses less digits than its factorization.

26891189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068566.

The product of its digits is 62208, while the sum is 44.

The square root of 26891189 is about 5185.6715090719. The cubic root of 26891189 is about 299.5964537077.

The spelling of 26891189 in words is "twenty-six million, eight hundred ninety-one thousand, one hundred eighty-nine".