198200009091 has 32 divisors (see below), whose sum is σ = 309233852928. Its totient is φ = 110554859520.

The previous prime is 198200009039. The next prime is 198200009101. The reversal of 198200009091 is 190900002891.

It is a happy number.

It is not a de Polignac number, because 198200009091 - 2¹⁸ = 198199746947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198200001091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1411171 + ... + 1545251.

It is an arithmetic number, because the mean of its divisors is an integer number (9663557904).

Almost surely, 2^198200009091 is an apocalyptic number.

198200009091 is a deficient number, since it is larger than the sum of its proper divisors (111033843837).

198200009091 is a wasteful number, since it uses less digits than its factorization.

198200009091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135771.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 198200009091 in words is "one hundred ninety-eight billion, two hundred million, nine thousand, ninety-one".