26815513 has 2 divisors, whose sum is σ = 26815514. Its totient is φ = 26815512.

The previous prime is 26815507. The next prime is 26815541. The reversal of 26815513 is 31551862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 12131289 = 3832^2 + 3483^2 .

It is a cyclic number.

It is not a de Polignac number, because 26815513 - 2¹³ = 26807321 is a prime.

It is not a weakly prime, because it can be changed into another prime (26815543) 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, 13407756 + 13407757.

It is an arithmetic number, because the mean of its divisors is an integer number (13407757).

Almost surely, 2^26815513 is an apocalyptic number.

It is an amenable number.

26815513 is a deficient number, since it is larger than the sum of its proper divisors (1).

26815513 is an equidigital number, since it uses as much as digits as its factorization.

26815513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The square root of 26815513 is about 5178.3697241506. The cubic root of 26815513 is about 299.3151526180.

The spelling of 26815513 in words is "twenty-six million, eight hundred fifteen thousand, five hundred thirteen".