216918963 has 12 divisors (see below), whose sum is σ = 331758648. Its totient is φ = 136105920.

The previous prime is 216918943. The next prime is 216918971. The reversal of 216918963 is 369819612.

It is a happy number.

It is not a de Polignac number, because 216918963 - 2⁵ = 216918931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216918943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 708733 + ... + 709038.

It is an arithmetic number, because the mean of its divisors is an integer number (27646554).

Almost surely, 2^216918963 is an apocalyptic number.

216918963 is a deficient number, since it is larger than the sum of its proper divisors (114839685).

216918963 is a wasteful number, since it uses less digits than its factorization.

216918963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417794 (or 1417791 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 216918963 is about 14728.1690308062. The cubic root of 216918963 is about 600.8496878163.

The spelling of 216918963 in words is "two hundred sixteen million, nine hundred eighteen thousand, nine hundred sixty-three".