216091953 has 24 divisors (see below), whose sum is σ = 389153856. Its totient is φ = 112255200.

The previous prime is 216091949. The next prime is 216091961. The reversal of 216091953 is 359190612.

It is not a de Polignac number, because 216091953 - 2² = 216091949 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216091943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155218 + ... + 156603.

It is an arithmetic number, because the mean of its divisors is an integer number (16214744).

Almost surely, 2^216091953 is an apocalyptic number.

It is an amenable number.

216091953 is a deficient number, since it is larger than the sum of its proper divisors (173061903).

216091953 is a wasteful number, since it uses less digits than its factorization.

216091953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311845 (or 311842 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 216091953 is about 14700.0664284213. The cubic root of 216091953 is about 600.0851295877.

The spelling of 216091953 in words is "two hundred sixteen million, ninety-one thousand, nine hundred fifty-three".