216345489 has 8 divisors (see below), whose sum is σ = 291107520. Its totient is φ = 142906896.

The previous prime is 216345487. The next prime is 216345491. The reversal of 216345489 is 984543612.

216345489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216345487) and next prime (216345491).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216345489 - 2¹ = 216345487 is a prime.

It is a super-2 number, since 2×216345489² = 93610741221298242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216345489.

It is not an unprimeable number, because it can be changed into a prime (216345487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330477 + ... + 331130.

It is an arithmetic number, because the mean of its divisors is an integer number (36388440).

Almost surely, 2^216345489 is an apocalyptic number.

It is an amenable number.

216345489 is a deficient number, since it is larger than the sum of its proper divisors (74762031).

216345489 is a wasteful number, since it uses less digits than its factorization.

216345489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661719.

The product of its digits is 207360, while the sum is 42.

The square root of 216345489 is about 14708.6875349230. The cubic root of 216345489 is about 600.3197268166.

The spelling of 216345489 in words is "two hundred sixteen million, three hundred forty-five thousand, four hundred eighty-nine".