9918122111 has 8 divisors (see below), whose sum is σ = 9944782848. Its totient is φ = 9891495000.

The previous prime is 9918122033. The next prime is 9918122147. The reversal of 9918122111 is 1112218199.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 9918122111 - 2¹⁴ = 9918105727 is a prime.

It is a super-5 number, since 5×9918122111⁵ (a number of 51 digits) contains 55555 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 (9918122171) 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, 649676 + ... + 664766.

It is an arithmetic number, because the mean of its divisors is an integer number (1243097856).

Almost surely, 2^9918122111 is an apocalyptic number.

9918122111 is a deficient number, since it is larger than the sum of its proper divisors (26660737).

9918122111 is a wasteful number, since it uses less digits than its factorization.

9918122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16813.

The product of its digits is 2592, while the sum is 35.

The square root of 9918122111 is about 99589.7691080766. The cubic root of 9918122111 is about 2148.5385497006.

The spelling of 9918122111 in words is "nine billion, nine hundred eighteen million, one hundred twenty-two thousand, one hundred eleven".