26399161 has 2 divisors, whose sum is σ = 26399162. Its totient is φ = 26399160.

The previous prime is 26399159. The next prime is 26399183. The reversal of 26399161 is 16199362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 8590761 = 4220^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 26399161 - 2¹ = 26399159 is a prime.

Together with 26399159, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 26399161.

It is not a weakly prime, because it can be changed into another prime (26399111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199580 + 13199581.

It is an arithmetic number, because the mean of its divisors is an integer number (13199581).

Almost surely, 2^26399161 is an apocalyptic number.

It is an amenable number.

26399161 is a deficient number, since it is larger than the sum of its proper divisors (1).

26399161 is an equidigital number, since it uses as much as digits as its factorization.

26399161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 26399161 is about 5138.0113857406. The cubic root of 26399161 is about 297.7579562446.

The spelling of 26399161 in words is "twenty-six million, three hundred ninety-nine thousand, one hundred sixty-one".