216598947 has 12 divisors (see below), whose sum is σ = 290165400. Its totient is φ = 143718400.

The previous prime is 216598933. The next prime is 216598951. The reversal of 216598947 is 749895612.

It is not a de Polignac number, because 216598947 - 2⁴ = 216598931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216598947.

It is not an unprimeable number, because it can be changed into a prime (216597947) 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 11 ways as a sum of consecutive naturals, for example, 482179 + ... + 482627.

It is an arithmetic number, because the mean of its divisors is an integer number (24180450).

Almost surely, 2^216598947 is an apocalyptic number.

216598947 is a deficient number, since it is larger than the sum of its proper divisors (73566453).

216598947 is an frugal number, since it uses more digits than its factorization.

216598947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 853 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 216598947 is about 14717.3009414091. The cubic root of 216598947 is about 600.5540687444.

The spelling of 216598947 in words is "two hundred sixteen million, five hundred ninety-eight thousand, nine hundred forty-seven".