216164091 has 16 divisors (see below), whose sum is σ = 338607360. Its totient is φ = 120930720.

The previous prime is 216164089. The next prime is 216164093. The reversal of 216164091 is 190461612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216164089) and next prime (216164093).

It is not a de Polignac number, because 216164091 - 2¹ = 216164089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216164093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251511 + ... + 252368.

It is an arithmetic number, because the mean of its divisors is an integer number (21162960).

Almost surely, 2^216164091 is an apocalyptic number.

216164091 is a deficient number, since it is larger than the sum of its proper divisors (122443269).

216164091 is a wasteful number, since it uses less digits than its factorization.

216164091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503906.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 216164091 is about 14702.5198860603. The cubic root of 216164091 is about 600.1518976530.

The spelling of 216164091 in words is "two hundred sixteen million, one hundred sixty-four thousand, ninety-one".