26165921 has 2 divisors, whose sum is σ = 26165922. Its totient is φ = 26165920.

The previous prime is 26165879. The next prime is 26165929. The reversal of 26165921 is 12956162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 774400 = 5039^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 26165921 - 2⁶ = 26165857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26165929) 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, 13082960 + 13082961.

It is an arithmetic number, because the mean of its divisors is an integer number (13082961).

Almost surely, 2^26165921 is an apocalyptic number.

It is an amenable number.

26165921 is a deficient number, since it is larger than the sum of its proper divisors (1).

26165921 is an equidigital number, since it uses as much as digits as its factorization.

26165921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 26165921 is about 5115.2635318232. The cubic root of 26165921 is about 296.8784509442.

The spelling of 26165921 in words is "twenty-six million, one hundred sixty-five thousand, nine hundred twenty-one".