216954047 has 4 divisors (see below), whose sum is σ = 217091496. Its totient is φ = 216816600.

The previous prime is 216954043. The next prime is 216954053. The reversal of 216954047 is 740459612.

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

It is a cyclic number.

It is not a de Polignac number, because 216954047 - 2² = 216954043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216954047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216954043) 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 3 ways as a sum of consecutive naturals, for example, 66329 + ... + 69522.

It is an arithmetic number, because the mean of its divisors is an integer number (54272874).

Almost surely, 2^216954047 is an apocalyptic number.

216954047 is a deficient number, since it is larger than the sum of its proper divisors (137449).

216954047 is a wasteful number, since it uses less digits than its factorization.

216954047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137448.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 216954047 is about 14729.3600336199. The cubic root of 216954047 is about 600.8820794428.

The spelling of 216954047 in words is "two hundred sixteen million, nine hundred fifty-four thousand, forty-seven".