215601 has 4 divisors (see below), whose sum is σ = 287472. Its totient is φ = 143732.

The previous prime is 215587. The next prime is 215617. The reversal of 215601 is 106512.

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 a cyclic number.

It is not a de Polignac number, because 215601 - 2¹¹ = 213553 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215681) 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, 35931 + ... + 35936.

It is an arithmetic number, because the mean of its divisors is an integer number (71868).

2²¹⁵⁶⁰¹ is an apocalyptic number.

It is an amenable number.

215601 is a deficient number, since it is larger than the sum of its proper divisors (71871).

215601 is an equidigital number, since it uses as much as digits as its factorization.

215601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71870.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 215601 is about 464.3285474747. The cubic root of 215601 is about 59.9630327840.

The spelling of 215601 in words is "two hundred fifteen thousand, six hundred one".