26291491 has 2 divisors, whose sum is σ = 26291492. Its totient is φ = 26291490.

The previous prime is 26291483. The next prime is 26291501. The reversal of 26291491 is 19419262.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26291491 - 2³ = 26291483 is a prime.

It is not a weakly prime, because it can be changed into another prime (26291191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13145745 + 13145746.

It is an arithmetic number, because the mean of its divisors is an integer number (13145746).

Almost surely, 2^26291491 is an apocalyptic number.

26291491 is a deficient number, since it is larger than the sum of its proper divisors (1).

26291491 is an equidigital number, since it uses as much as digits as its factorization.

26291491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 26291491 is about 5127.5228912215. The cubic root of 26291491 is about 297.3525988721.

The spelling of 26291491 in words is "twenty-six million, two hundred ninety-one thousand, four hundred ninety-one".