215171601 has 16 divisors (see below), whose sum is σ = 316980864. Its totient is φ = 129138944.

The previous prime is 215171597. The next prime is 215171603. The reversal of 215171601 is 106171512.

It is a cyclic number.

It is not a de Polignac number, because 215171601 - 2² = 215171597 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215171603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90546 + ... + 92891.

It is an arithmetic number, because the mean of its divisors is an integer number (19811304).

Almost surely, 2^215171601 is an apocalyptic number.

It is an amenable number.

215171601 is a deficient number, since it is larger than the sum of its proper divisors (101809263).

215171601 is a wasteful number, since it uses less digits than its factorization.

215171601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183480.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 215171601 is about 14668.7286770190. The cubic root of 215171601 is about 599.2319812203.

The spelling of 215171601 in words is "two hundred fifteen million, one hundred seventy-one thousand, six hundred one".