216615494 has 4 divisors (see below), whose sum is σ = 324923244. Its totient is φ = 108307746.

The previous prime is 216615493. The next prime is 216615557. The reversal of 216615494 is 494516612.

216615494 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216615493) 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 as a sum of consecutive naturals, namely, 54153872 + ... + 54153875.

It is an arithmetic number, because the mean of its divisors is an integer number (81230811).

Almost surely, 2^216615494 is an apocalyptic number.

216615494 is a deficient number, since it is larger than the sum of its proper divisors (108307750).

216615494 is a wasteful number, since it uses less digits than its factorization.

216615494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108307749.

The product of its digits is 51840, while the sum is 38.

The square root of 216615494 is about 14717.8630921748. The cubic root of 216615494 is about 600.5693613936.

The spelling of 216615494 in words is "two hundred sixteen million, six hundred fifteen thousand, four hundred ninety-four".