216458919 has 16 divisors (see below), whose sum is σ = 320988640. Its totient is φ = 144167040.

The previous prime is 216458903. The next prime is 216458951. The reversal of 216458919 is 919854612.

216458919 is a `hidden beast` number, since 2 + 1 + 64 + 589 + 1 + 9 = 666.

It is not a de Polignac number, because 216458919 - 2⁴ = 216458903 is a prime.

It is a super-2 number, since 2×216458919² = 93708927229297122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216458959) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30159 + ... + 36639.

It is an arithmetic number, because the mean of its divisors is an integer number (20061790).

Almost surely, 2^216458919 is an apocalyptic number.

216458919 is a deficient number, since it is larger than the sum of its proper divisors (104529721).

216458919 is a wasteful number, since it uses less digits than its factorization.

216458919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7727 (or 7721 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 216458919 is about 14712.5429141260. The cubic root of 216458919 is about 600.4246244193.

The spelling of 216458919 in words is "two hundred sixteen million, four hundred fifty-eight thousand, nine hundred nineteen".