26158109 has 2 divisors, whose sum is σ = 26158110. Its totient is φ = 26158108.

The previous prime is 26158103. The next prime is 26158127. The reversal of 26158109 is 90185162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24970009 + 1188100 = 4997^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 26158109 - 2²⁴ = 9380893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26158103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13079054 + 13079055.

It is an arithmetic number, because the mean of its divisors is an integer number (13079055).

Almost surely, 2^26158109 is an apocalyptic number.

It is an amenable number.

26158109 is a deficient number, since it is larger than the sum of its proper divisors (1).

26158109 is an equidigital number, since it uses as much as digits as its factorization.

26158109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 26158109 is about 5114.4998777984. The cubic root of 26158109 is about 296.8489030283.

The spelling of 26158109 in words is "twenty-six million, one hundred fifty-eight thousand, one hundred nine".