193981113 has 18 divisors (see below), whose sum is σ = 285618606. Its totient is φ = 126864192.

The previous prime is 193981069. The next prime is 193981129. The reversal of 193981113 is 311189391.

It can be written as a sum of positive squares in 3 ways, for example, as 78375609 + 115605504 = 8853^2 + 10752^2 .

It is a de Polignac number, because none of the positive numbers 2^k-193981113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (193981133) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21445 + ... + 29117.

Almost surely, 2^193981113 is an apocalyptic number.

It is an amenable number.

193981113 is a deficient number, since it is larger than the sum of its proper divisors (91637493).

193981113 is an equidigital number, since it uses as much as digits as its factorization.

193981113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7785 (or 7729 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 193981113 is about 13927.7102568943. The cubic root of 193981113 is about 578.8772503260.

The spelling of 193981113 in words is "one hundred ninety-three million, nine hundred eighty-one thousand, one hundred thirteen".