826513 has 4 divisors (see below), whose sum is σ = 828340. Its totient is φ = 824688.

The previous prime is 826499. The next prime is 826541. The reversal of 826513 is 315628.

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 603729 + 222784 = 777^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 826513 - 2¹⁷ = 695441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (826583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (207085).

2⁸²⁶⁵¹³ is an apocalyptic number.

It is an amenable number.

826513 is a deficient number, since it is larger than the sum of its proper divisors (1827).

826513 is an equidigital number, since it uses as much as digits as its factorization.

826513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826.

The product of its digits is 1440, while the sum is 25.

The square root of 826513 is about 909.1276038049. The cubic root of 826513 is about 93.8461721243.

The spelling of 826513 in words is "eight hundred twenty-six thousand, five hundred thirteen".