26159991 has 48 divisors (see below), whose sum is σ = 43736448. Its totient is φ = 13708800.

The previous prime is 26159921. The next prime is 26160011. The reversal of 26159991 is 19995162.

It is a happy number.

It is not a de Polignac number, because 26159991 - 2⁷ = 26159863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26159921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123876 + ... + 124086.

It is an arithmetic number, because the mean of its divisors is an integer number (911176).

Almost surely, 2^26159991 is an apocalyptic number.

26159991 is a deficient number, since it is larger than the sum of its proper divisors (17576457).

26159991 is a wasteful number, since it uses less digits than its factorization.

26159991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 255 counting only the distinct ones).

The product of its digits is 43740, while the sum is 42.

The square root of 26159991 is about 5114.6838611981. The cubic root of 26159991 is about 296.8560219964.

The spelling of 26159991 in words is "twenty-six million, one hundred fifty-nine thousand, nine hundred ninety-one".