9121198 has 4 divisors (see below), whose sum is σ = 13681800. Its totient is φ = 4560598.

The previous prime is 9121193. The next prime is 9121199. The reversal of 9121198 is 8911219.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9121193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2280298 + ... + 2280301.

It is an arithmetic number, because the mean of its divisors is an integer number (3420450).

Almost surely, 2^9121198 is an apocalyptic number.

9121198 is a deficient number, since it is larger than the sum of its proper divisors (4560602).

9121198 is a wasteful number, since it uses less digits than its factorization.

9121198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560601.

The product of its digits is 1296, while the sum is 31.

The square root of 9121198 is about 3020.1321163154. The cubic root of 9121198 is about 208.9379332346.

The spelling of 9121198 in words is "nine million, one hundred twenty-one thousand, one hundred ninety-eight".