216970091 has 8 divisors (see below), whose sum is σ = 233882880. Its totient is φ = 200089152.

The previous prime is 216970069. The next prime is 216970093. The reversal of 216970091 is 190079612.

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

It is a cyclic number.

It is not a de Polignac number, because 216970091 - 2¹⁴ = 216953707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216970093) 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, 7286 + ... + 22068.

It is an arithmetic number, because the mean of its divisors is an integer number (29235360).

Almost surely, 2^216970091 is an apocalyptic number.

216970091 is a deficient number, since it is larger than the sum of its proper divisors (16912789).

216970091 is a wasteful number, since it uses less digits than its factorization.

216970091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15925.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 216970091 is about 14729.9046500648. The cubic root of 216970091 is about 600.8968910501.

The spelling of 216970091 in words is "two hundred sixteen million, nine hundred seventy thousand, ninety-one".