217063081 has 4 divisors (see below), whose sum is σ = 217138000. Its totient is φ = 216988164.

The previous prime is 217063073. The next prime is 217063103. The reversal of 217063081 is 180360712.

217063081 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 not a de Polignac number, because 217063081 - 2³ = 217063073 is a prime.

It is a super-2 number, since 2×217063081² = 94232762266425122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217063381) 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, 32931 + ... + 38968.

It is an arithmetic number, because the mean of its divisors is an integer number (54284500).

Almost surely, 2^217063081 is an apocalyptic number.

It is an amenable number.

217063081 is a deficient number, since it is larger than the sum of its proper divisors (74919).

217063081 is an equidigital number, since it uses as much as digits as its factorization.

217063081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74918.

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

The square root of 217063081 is about 14733.0608157300. The cubic root of 217063081 is about 600.9827238037.

The spelling of 217063081 in words is "two hundred seventeen million, sixty-three thousand, eighty-one".