812513 has 4 divisors (see below), whose sum is σ = 875028. Its totient is φ = 750000.

The previous prime is 812503. The next prime is 812519. The reversal of 812513 is 315218.

812513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 559504 + 253009 = 748^2 + 503^2 .

It is a cyclic number.

It is not a de Polignac number, because 812513 - 2⁸ = 812257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (812519) 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, 31238 + ... + 31263.

It is an arithmetic number, because the mean of its divisors is an integer number (218757).

2⁸¹²⁵¹³ is an apocalyptic number.

It is an amenable number.

812513 is a deficient number, since it is larger than the sum of its proper divisors (62515).

812513 is a wasteful number, since it uses less digits than its factorization.

812513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62514.

The product of its digits is 240, while the sum is 20.

The square root of 812513 is about 901.3950299397. The cubic root of 812513 is about 93.3132765859.

It can be divided in two parts, 8125 and 13, that multiplied together give a square (105625 = 325²).

The spelling of 812513 in words is "eight hundred twelve thousand, five hundred thirteen".