9911818 has 12 divisors (see below), whose sum is σ = 17295282. Its totient is φ = 4247880.

The previous prime is 9911809. The next prime is 9911821. The reversal of 9911818 is 8181199.

It is a happy number.

9911818 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7112889 + 2798929 = 2667^2 + 1673^2 .

It is a super-3 number, since 3×9911818³ (a number of 22 digits) contains 333 as substring.

9911818 is strictly pandigital in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50473 + ... + 50668.

Almost surely, 2^9911818 is an apocalyptic number.

9911818 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

9911818 is a deficient number, since it is larger than the sum of its proper divisors (7383464).

9911818 is a wasteful number, since it uses less digits than its factorization.

9911818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101157 (or 101150 counting only the distinct ones).

The product of its digits is 5184, while the sum is 37.

The square root of 9911818 is about 3148.3039878639. The cubic root of 9911818 is about 214.8083238500.

It can be divided in two parts, 991 and 1818, that added together give a square (2809 = 53²).

The spelling of 9911818 in words is "nine million, nine hundred eleven thousand, eight hundred eighteen".