193681189 has 4 divisors (see below), whose sum is σ = 208579756. Its totient is φ = 178782624.

The previous prime is 193681157. The next prime is 193681249. The reversal of 193681189 is 981186391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51236964 + 142444225 = 7158^2 + 11935^2 .

It is a cyclic number.

It is not a de Polignac number, because 193681189 - 2⁵ = 193681157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193681489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7449264 + ... + 7449289.

It is an arithmetic number, because the mean of its divisors is an integer number (52144939).

Almost surely, 2^193681189 is an apocalyptic number.

It is an amenable number.

193681189 is a deficient number, since it is larger than the sum of its proper divisors (14898567).

193681189 is a wasteful number, since it uses less digits than its factorization.

193681189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14898566.

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

The square root of 193681189 is about 13916.9389234846. The cubic root of 193681189 is about 578.5787526439.

The spelling of 193681189 in words is "one hundred ninety-three million, six hundred eighty-one thousand, one hundred eighty-nine".