216953913 has 32 divisors (see below), whose sum is σ = 333849600. Its totient is φ = 123940800.

The previous prime is 216953909. The next prime is 216953921. The reversal of 216953913 is 319359612.

It is not a de Polignac number, because 216953913 - 2² = 216953909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216953993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142828 + ... + 144338.

It is an arithmetic number, because the mean of its divisors is an integer number (10432800).

Almost surely, 2^216953913 is an apocalyptic number.

It is an amenable number.

216953913 is a deficient number, since it is larger than the sum of its proper divisors (116895687).

216953913 is a wasteful number, since it uses less digits than its factorization.

216953913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773.

The product of its digits is 43740, while the sum is 39.

The square root of 216953913 is about 14729.3554848812. The cubic root of 216953913 is about 600.8819557327.

The spelling of 216953913 in words is "two hundred sixteen million, nine hundred fifty-three thousand, nine hundred thirteen".