9813965218 has 4 divisors (see below), whose sum is σ = 14720947830. Its totient is φ = 4906982608.

The previous prime is 9813965201. The next prime is 9813965219. The reversal of 9813965218 is 8125693189.

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

It can be written as a sum of positive squares in only one way, i.e., 9016072209 + 797893009 = 94953^2 + 28247^2 .

It is a super-2 number, since 2×9813965218² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9813965219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2453491303 + ... + 2453491306.

Almost surely, 2^9813965218 is an apocalyptic number.

9813965218 is a deficient number, since it is larger than the sum of its proper divisors (4906982612).

9813965218 is a wasteful number, since it uses less digits than its factorization.

9813965218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906982611.

The product of its digits is 933120, while the sum is 52.

The square root of 9813965218 is about 99065.4592580078. The cubic root of 9813965218 is about 2140.9909826395.

The spelling of 9813965218 in words is "nine billion, eight hundred thirteen million, nine hundred sixty-five thousand, two hundred eighteen".