217339081 has 4 divisors (see below), whose sum is σ = 228778000. Its totient is φ = 205900164.

The previous prime is 217339063. The next prime is 217339093. The reversal of 217339081 is 180933712.

217339081 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217339081 is a prime.

It is a super-2 number, since 2×217339081² = 94472552259849122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217339181) 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, 5719431 + ... + 5719468.

It is an arithmetic number, because the mean of its divisors is an integer number (57194500).

Almost surely, 2^217339081 is an apocalyptic number.

It is an amenable number.

217339081 is a deficient number, since it is larger than the sum of its proper divisors (11438919).

217339081 is a wasteful number, since it uses less digits than its factorization.

217339081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11438918.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 217339081 is about 14742.4245292286. The cubic root of 217339081 is about 601.2373363919.

The spelling of 217339081 in words is "two hundred seventeen million, three hundred thirty-nine thousand, eighty-one".