26160721 has 2 divisors, whose sum is σ = 26160722. Its totient is φ = 26160720.

The previous prime is 26160713. The next prime is 26160733. The reversal of 26160721 is 12706162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 12173121 = 3740^2 + 3489^2 .

It is a cyclic number.

It is not a de Polignac number, because 26160721 - 2³ = 26160713 is a prime.

It is not a weakly prime, because it can be changed into another prime (26160781) 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, 13080360 + 13080361.

It is an arithmetic number, because the mean of its divisors is an integer number (13080361).

Almost surely, 2^26160721 is an apocalyptic number.

It is an amenable number.

26160721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26160721 is an equidigital number, since it uses as much as digits as its factorization.

26160721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 26160721 is about 5114.7552238597. The cubic root of 26160721 is about 296.8587832471.

Adding to 26160721 its reverse (12706162), we get a palindrome (38866883).

The spelling of 26160721 in words is "twenty-six million, one hundred sixty thousand, seven hundred twenty-one".