26991163 has 2 divisors, whose sum is σ = 26991164. Its totient is φ = 26991162.

The previous prime is 26991127. The next prime is 26991169. The reversal of 26991163 is 36119962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26991163 - 2⁹ = 26990651 is a prime.

It is not a weakly prime, because it can be changed into another prime (26991169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13495581 + 13495582.

It is an arithmetic number, because the mean of its divisors is an integer number (13495582).

Almost surely, 2^26991163 is an apocalyptic number.

26991163 is a deficient number, since it is larger than the sum of its proper divisors (1).

26991163 is an equidigital number, since it uses as much as digits as its factorization.

26991163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 26991163 is about 5195.3020123954. The cubic root of 26991163 is about 299.9672667990.

The spelling of 26991163 in words is "twenty-six million, nine hundred ninety-one thousand, one hundred sixty-three".