26516521 has 2 divisors, whose sum is σ = 26516522. Its totient is φ = 26516520.

The previous prime is 26516491. The next prime is 26516543. The reversal of 26516521 is 12561562.

26516521 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24157225 + 2359296 = 4915^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 26516521 - 2¹⁹ = 25992233 is a prime.

It is a super-3 number, since 3×26516521³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26516521.

It is not a weakly prime, because it can be changed into another prime (26516561) 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, 13258260 + 13258261.

It is an arithmetic number, because the mean of its divisors is an integer number (13258261).

Almost surely, 2^26516521 is an apocalyptic number.

It is an amenable number.

26516521 is a deficient number, since it is larger than the sum of its proper divisors (1).

26516521 is an equidigital number, since it uses as much as digits as its factorization.

26516521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 26516521 is about 5149.4194818445. The cubic root of 26516521 is about 298.1985411766.

The spelling of 26516521 in words is "twenty-six million, five hundred sixteen thousand, five hundred twenty-one".