217064161 has 4 divisors (see below), whose sum is σ = 218501824. Its totient is φ = 215626500.

The previous prime is 217064153. The next prime is 217064167. The reversal of 217064161 is 161460712.

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 217064161 - 2³ = 217064153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217064167) 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, 718605 + ... + 718906.

It is an arithmetic number, because the mean of its divisors is an integer number (54625456).

Almost surely, 2^217064161 is an apocalyptic number.

It is an amenable number.

217064161 is a deficient number, since it is larger than the sum of its proper divisors (1437663).

217064161 is a wasteful number, since it uses less digits than its factorization.

217064161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437662.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 217064161 is about 14733.0974679461. The cubic root of 217064161 is about 600.9837205343.

The spelling of 217064161 in words is "two hundred seventeen million, sixty-four thousand, one hundred sixty-one".