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26161 has 2 divisors, whose sum is σ = 26162. Its totient is φ = 26160.

The previous prime is 26153. The next prime is 26171. The reversal of 26161 is 16162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19600 + 6561 = 140^2 + 81^2 .

It is a cyclic number.

It is not a de Polignac number, because 26161 - 23 = 26153 is a prime.

It is an Ulam number.

It is a nialpdrome in base 13 and base 16.

It is not a weakly prime, because it can be changed into another prime (26111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13080 + 13081.

It is an arithmetic number, because the mean of its divisors is an integer number (13081).

226161 is an apocalyptic number.

It is an amenable number.

26161 is a deficient number, since it is larger than the sum of its proper divisors (1).

26161 is an equidigital number, since it uses as much as digits as its factorization.

26161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 26161 is about 161.7436242947. The cubic root of 26161 is about 29.6859838561.

Subtracting from 26161 its reverse (16162), we obtain a palindrome (9999).

It can be divided in two parts, 26 and 161, that multiplied together give a triangular number (4186 = T91).

The spelling of 26161 in words is "twenty-six thousand, one hundred sixty-one".