216971494 has 16 divisors (see below), whose sum is σ = 328703760. Its totient is φ = 107408160.

The previous prime is 216971483. The next prime is 216971509. The reversal of 216971494 is 494179612.

216971494 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 216971494.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 127312 + ... + 129004.

It is an arithmetic number, because the mean of its divisors is an integer number (20543985).

Almost surely, 2^216971494 is an apocalyptic number.

216971494 is a deficient number, since it is larger than the sum of its proper divisors (111732266).

216971494 is a wasteful number, since it uses less digits than its factorization.

216971494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295.

The product of its digits is 108864, while the sum is 43.

The square root of 216971494 is about 14729.9522741929. The cubic root of 216971494 is about 600.8981862463.

The spelling of 216971494 in words is "two hundred sixteen million, nine hundred seventy-one thousand, four hundred ninety-four".