26981291 has 2 divisors, whose sum is σ = 26981292. Its totient is φ = 26981290.

The previous prime is 26981267. The next prime is 26981299. The reversal of 26981291 is 19218962.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26981291 is a prime.

It is not a weakly prime, because it can be changed into another prime (26981299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13490645 + 13490646.

It is an arithmetic number, because the mean of its divisors is an integer number (13490646).

Almost surely, 2^26981291 is an apocalyptic number.

26981291 is a deficient number, since it is larger than the sum of its proper divisors (1).

26981291 is an equidigital number, since it uses as much as digits as its factorization.

26981291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 26981291 is about 5194.3518363700. The cubic root of 26981291 is about 299.9306913964.

It can be divided in two parts, 26981 and 291, that added together give a palindrome (27272).

The spelling of 26981291 in words is "twenty-six million, nine hundred eighty-one thousand, two hundred ninety-one".