215701 has 4 divisors (see below), whose sum is σ = 221004. Its totient is φ = 210400.

The previous prime is 215693. The next prime is 215723. The reversal of 215701 is 107512.

215701 = 5² + 6² + ... + 86².

215701 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 75076 + 140625 = 274^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 215701 - 2³ = 215693 is a prime.

It is a Duffinian number.

215701 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215771) 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, 2590 + ... + 2671.

It is an arithmetic number, because the mean of its divisors is an integer number (55251).

2²¹⁵⁷⁰¹ is an apocalyptic number.

It is an amenable number.

215701 is a deficient number, since it is larger than the sum of its proper divisors (5303).

215701 is an equidigital number, since it uses as much as digits as its factorization.

215701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 215701 is about 464.4362173647. The cubic root of 215701 is about 59.9723020305.

The spelling of 215701 in words is "two hundred fifteen thousand, seven hundred one".