26901991 has 2 divisors, whose sum is σ = 26901992. Its totient is φ = 26901990.

The previous prime is 26901977. The next prime is 26902013. The reversal of 26901991 is 19910962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26901991 - 2¹⁵ = 26869223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26901991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26901491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13450995 + 13450996.

It is an arithmetic number, because the mean of its divisors is an integer number (13450996).

Almost surely, 2^26901991 is an apocalyptic number.

26901991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26901991 is an equidigital number, since it uses as much as digits as its factorization.

26901991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 26901991 is about 5186.7129282427. The cubic root of 26901991 is about 299.6365635948.

The spelling of 26901991 in words is "twenty-six million, nine hundred one thousand, nine hundred ninety-one".