815313 has 4 divisors (see below), whose sum is σ = 1087088. Its totient is φ = 543540.

The previous prime is 815291. The next prime is 815317. The reversal of 815313 is 313518.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 815313 - 2¹⁴ = 798929 is a prime.

It is a D-number.

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 815313.

It is not an unprimeable number, because it can be changed into a prime (815317) 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, 135883 + ... + 135888.

It is an arithmetic number, because the mean of its divisors is an integer number (271772).

2⁸¹⁵³¹³ is an apocalyptic number.

It is an amenable number.

815313 is a deficient number, since it is larger than the sum of its proper divisors (271775).

815313 is a wasteful number, since it uses less digits than its factorization.

815313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271774.

The product of its digits is 360, while the sum is 21.

The square root of 815313 is about 902.9468422892. The cubic root of 815313 is about 93.4203426139.

It can be divided in two parts, 815 and 313, that added together give a triangular number (1128 = T₄₇).

The spelling of 815313 in words is "eight hundred fifteen thousand, three hundred thirteen".