215057 has 4 divisors (see below), whose sum is σ = 217140. Its totient is φ = 212976.

The previous prime is 215051. The next prime is 215063. The reversal of 215057 is 750512.

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

It is an interprime number because it is at equal distance from previous prime (215051) and next prime (215063).

It can be written as a sum of positive squares in 2 ways, for example, as 96721 + 118336 = 311^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 215057 - 2⁶ = 214993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215051) 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, 878 + ... + 1095.

It is an arithmetic number, because the mean of its divisors is an integer number (54285).

2²¹⁵⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

215057 is a deficient number, since it is larger than the sum of its proper divisors (2083).

215057 is a wasteful number, since it uses less digits than its factorization.

215057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 215057 is about 463.7423853822. The cubic root of 215057 is about 59.9125578115.

Adding to 215057 its reverse (750512), we get a palindrome (965569).

It can be divided in two parts, 21505 and 7, that added together give a palindrome (21512).

The spelling of 215057 in words is "two hundred fifteen thousand, fifty-seven".