216341989 has 4 divisors (see below), whose sum is σ = 216509580. Its totient is φ = 216174400.

The previous prime is 216341977. The next prime is 216342011. The reversal of 216341989 is 989143612.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41705764 + 174636225 = 6458^2 + 13215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216341989 is a prime.

It is a super-2 number, since 2×216341989² = 93607712408952242, 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 (216341969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81844 + ... + 84445.

It is an arithmetic number, because the mean of its divisors is an integer number (54127395).

Almost surely, 2^216341989 is an apocalyptic number.

It is an amenable number.

216341989 is a deficient number, since it is larger than the sum of its proper divisors (167591).

216341989 is a wasteful number, since it uses less digits than its factorization.

216341989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167590.

The product of its digits is 93312, while the sum is 43.

The square root of 216341989 is about 14708.5685571370. The cubic root of 216341989 is about 600.3164895094.

The spelling of 216341989 in words is "two hundred sixteen million, three hundred forty-one thousand, nine hundred eighty-nine".