198273691 has 8 divisors (see below), whose sum is σ = 247198464. Its totient is φ = 154498920.

The previous prime is 198273679. The next prime is 198273697. The reversal of 198273691 is 196372891.

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 198273691 - 2⁵ = 198273659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198273697) 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, 1287415 + ... + 1287568.

It is an arithmetic number, because the mean of its divisors is an integer number (30899808).

Almost surely, 2^198273691 is an apocalyptic number.

198273691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198273691 is a deficient number, since it is larger than the sum of its proper divisors (48924773).

198273691 is a wasteful number, since it uses less digits than its factorization.

198273691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575001.

The product of its digits is 163296, while the sum is 46.

The square root of 198273691 is about 14080.9691072738. The cubic root of 198273691 is about 583.1160971420.

The spelling of 198273691 in words is "one hundred ninety-eight million, two hundred seventy-three thousand, six hundred ninety-one".