26681513 has 4 divisors (see below), whose sum is σ = 26692308. Its totient is φ = 26670720.

The previous prime is 26681507. The next prime is 26681521. The reversal of 26681513 is 31518662.

26681513 = 3652² + 3653².

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13344409 + 13337104 = 3653^2 + 3652^2 .

It is a cyclic number.

It is not a de Polignac number, because 26681513 - 2⁴ = 26681497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26681513.

It is not an unprimeable number, because it can be changed into a prime (26681503) 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 in 3 ways as a sum of consecutive naturals, for example, 353 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (6673077).

Almost surely, 2^26681513 is an apocalyptic number.

26681513 is the 3653-rd centered square number.

It is an amenable number.

26681513 is a deficient number, since it is larger than the sum of its proper divisors (10795).

26681513 is an equidigital number, since it uses as much as digits as its factorization.

26681513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10794.

The product of its digits is 8640, while the sum is 32.

The square root of 26681513 is about 5165.4150849666. The cubic root of 26681513 is about 298.8157498417.

The spelling of 26681513 in words is "twenty-six million, six hundred eighty-one thousand, five hundred thirteen".