26891231 has 2 divisors, whose sum is σ = 26891232. Its totient is φ = 26891230.

The previous prime is 26891219. The next prime is 26891243. The reversal of 26891231 is 13219862.

It is a balanced prime because it is at equal distance from previous prime (26891219) and next prime (26891243).

It is a cyclic number.

It is not a de Polignac number, because 26891231 - 2¹⁴ = 26874847 is a prime.

It is a super-2 number, since 2×26891231² = 1446276609390722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26891201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13445615 + 13445616.

It is an arithmetic number, because the mean of its divisors is an integer number (13445616).

Almost surely, 2^26891231 is an apocalyptic number.

26891231 is a deficient number, since it is larger than the sum of its proper divisors (1).

26891231 is an equidigital number, since it uses as much as digits as its factorization.

26891231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 26891231 is about 5185.6755586905. The cubic root of 26891231 is about 299.5966096825.

The spelling of 26891231 in words is "twenty-six million, eight hundred ninety-one thousand, two hundred thirty-one".