26290591 has 2 divisors, whose sum is σ = 26290592. Its totient is φ = 26290590.

The previous prime is 26290567. The next prime is 26290601. The reversal of 26290591 is 19509262.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26290591 - 2¹⁷ = 26159519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26290391) 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, 13145295 + 13145296.

It is an arithmetic number, because the mean of its divisors is an integer number (13145296).

Almost surely, 2^26290591 is an apocalyptic number.

26290591 is a deficient number, since it is larger than the sum of its proper divisors (1).

26290591 is an equidigital number, since it uses as much as digits as its factorization.

26290591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 26290591 is about 5127.4351287949. The cubic root of 26290591 is about 297.3492058809.

The spelling of 26290591 in words is "twenty-six million, two hundred ninety thousand, five hundred ninety-one".