991694198 has 8 divisors (see below), whose sum is σ = 1622772360. Its totient is φ = 450770080.

The previous prime is 991694153. The next prime is 991694203. The reversal of 991694198 is 891496199.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22538483 + ... + 22538526.

It is an arithmetic number, because the mean of its divisors is an integer number (202846545).

Almost surely, 2^991694198 is an apocalyptic number.

991694198 is a deficient number, since it is larger than the sum of its proper divisors (631078162).

991694198 is a wasteful number, since it uses less digits than its factorization.

991694198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45077022.

The product of its digits is 1259712, while the sum is 56.

The square root of 991694198 is about 31491.1765102544. The cubic root of 991694198 is about 997.2236986171.

The spelling of 991694198 in words is "nine hundred ninety-one million, six hundred ninety-four thousand, one hundred ninety-eight".