216570993 has 8 divisors (see below), whose sum is σ = 291565248. Its totient is φ = 142978704.

The previous prime is 216570989. The next prime is 216570997. The reversal of 216570993 is 399075612.

216570993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216570989) and next prime (216570997).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216570993 - 2² = 216570989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216570997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350130 + ... + 350747.

It is an arithmetic number, because the mean of its divisors is an integer number (36445656).

Almost surely, 2^216570993 is an apocalyptic number.

It is an amenable number.

216570993 is a deficient number, since it is larger than the sum of its proper divisors (74994255).

216570993 is a wasteful number, since it uses less digits than its factorization.

216570993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700983.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 216570993 is about 14716.3512121721. The cubic root of 216570993 is about 600.5282320373.

The spelling of 216570993 in words is "two hundred sixteen million, five hundred seventy thousand, nine hundred ninety-three".