26299991 has 2 divisors, whose sum is σ = 26299992. Its totient is φ = 26299990.

The previous prime is 26299957. The next prime is 26300011. The reversal of 26299991 is 19999262.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26299991 - 2¹⁰ = 26298967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26299921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13149995 + 13149996.

It is an arithmetic number, because the mean of its divisors is an integer number (13149996).

Almost surely, 2^26299991 is an apocalyptic number.

26299991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26299991 is an equidigital number, since it uses as much as digits as its factorization.

26299991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 47.

The square root of 26299991 is about 5128.3516845084. The cubic root of 26299991 is about 297.3846399706.

The spelling of 26299991 in words is "twenty-six million, two hundred ninety-nine thousand, nine hundred ninety-one".