113198691891 has 8 divisors (see below), whose sum is σ = 158875357120. Its totient is φ = 71493910632.

The previous prime is 113198691887. The next prime is 113198691953. The reversal of 113198691891 is 198196891311.

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

It is not a de Polignac number, because 113198691891 - 2² = 113198691887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 1985941963 = 113198691891 / (1 + 1 + 3 + 1 + 9 + 8 + 6 + 9 + 1 + 8 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113198691841) 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, 992970925 + ... + 992971038.

It is an arithmetic number, because the mean of its divisors is an integer number (19859419640).

Almost surely, 2^113198691891 is an apocalyptic number.

113198691891 is a deficient number, since it is larger than the sum of its proper divisors (45676665229).

113198691891 is a wasteful number, since it uses less digits than its factorization.

113198691891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985941985.

The product of its digits is 839808, while the sum is 57.

The spelling of 113198691891 in words is "one hundred thirteen billion, one hundred ninety-eight million, six hundred ninety-one thousand, eight hundred ninety-one".