26010991 has 2 divisors, whose sum is σ = 26010992. Its totient is φ = 26010990.

The previous prime is 26010989. The next prime is 26011021. The reversal of 26010991 is 19901062.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26010991 - 2¹ = 26010989 is a prime.

Together with 26010989, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26010911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13005495 + 13005496.

It is an arithmetic number, because the mean of its divisors is an integer number (13005496).

Almost surely, 2^26010991 is an apocalyptic number.

26010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26010991 is an equidigital number, since it uses as much as digits as its factorization.

26010991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 26010991 is about 5100.0971559373. The cubic root of 26010991 is about 296.2913455679.

The spelling of 26010991 in words is "twenty-six million, ten thousand, nine hundred ninety-one".