26506481 has 2 divisors, whose sum is σ = 26506482. Its totient is φ = 26506480.

The previous prime is 26506477. The next prime is 26506483. The reversal of 26506481 is 18460562.

26506481 = 3640² + 3641².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13256881 + 13249600 = 3641^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 26506481 - 2² = 26506477 is a prime.

It is a super-2 number, since 2×26506481² = 1405187070006722, which contains 22 as substring.

Together with 26506483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26506483) 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, 13253240 + 13253241.

It is an arithmetic number, because the mean of its divisors is an integer number (13253241).

Almost surely, 2^26506481 is an apocalyptic number.

26506481 is the 3641-st centered square number.

It is an amenable number.

26506481 is a deficient number, since it is larger than the sum of its proper divisors (1).

26506481 is an equidigital number, since it uses as much as digits as its factorization.

26506481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 26506481 is about 5148.4445223776. Note that the first 3 decimals coincide. The cubic root of 26506481 is about 298.1609006016.

The spelling of 26506481 in words is "twenty-six million, five hundred six thousand, four hundred eighty-one".