26259991 has 2 divisors, whose sum is σ = 26259992. Its totient is φ = 26259990.

The previous prime is 26259979. The next prime is 26260021. The reversal of 26259991 is 19995262.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26259991 - 2²³ = 17871383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26259901) 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, 13129995 + 13129996.

It is an arithmetic number, because the mean of its divisors is an integer number (13129996).

Almost surely, 2^26259991 is an apocalyptic number.

26259991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26259991 is an equidigital number, since it uses as much as digits as its factorization.

26259991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 26259991 is about 5124.4503119847. The cubic root of 26259991 is about 297.2337980772.

The spelling of 26259991 in words is "twenty-six million, two hundred fifty-nine thousand, nine hundred ninety-one".