188116993 has 4 divisors (see below), whose sum is σ = 188710740. Its totient is φ = 187523248.

The previous prime is 188116987. The next prime is 188117009. The reversal of 188116993 is 399611881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399611881 = 103 ⋅3879727.

It can be written as a sum of positive squares in 2 ways, for example, as 110817729 + 77299264 = 10527^2 + 8792^2 .

It is a cyclic number.

It is not a de Polignac number, because 188116993 - 2²⁵ = 154562561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188116963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296398 + ... + 297031.

It is an arithmetic number, because the mean of its divisors is an integer number (47177685).

Almost surely, 2^188116993 is an apocalyptic number.

It is an amenable number.

188116993 is a deficient number, since it is larger than the sum of its proper divisors (593747).

188116993 is an equidigital number, since it uses as much as digits as its factorization.

188116993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593746.

The product of its digits is 93312, while the sum is 46.

The square root of 188116993 is about 13715.5748330137. The cubic root of 188116993 is about 572.9842389524.

The spelling of 188116993 in words is "one hundred eighty-eight million, one hundred sixteen thousand, nine hundred ninety-three".