215713 has 4 divisors (see below), whose sum is σ = 228420. Its totient is φ = 203008.

The previous prime is 215693. The next prime is 215723. The reversal of 215713 is 317512.

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 91809 + 123904 = 303^2 + 352^2 .

It is a cyclic number.

It is not a de Polignac number, because 215713 - 2⁵ = 215681 is a prime.

It is a Duffinian number.

215713 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (215723) 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, 6328 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (57105).

2²¹⁵⁷¹³ is an apocalyptic number.

It is an amenable number.

215713 is a deficient number, since it is larger than the sum of its proper divisors (12707).

215713 is a wasteful number, since it uses less digits than its factorization.

215713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12706.

The product of its digits is 210, while the sum is 19.

The square root of 215713 is about 464.4491360741. The cubic root of 215713 is about 59.9734141475.

The spelling of 215713 in words is "two hundred fifteen thousand, seven hundred thirteen".