194751139 has 4 divisors (see below), whose sum is σ = 212455800. Its totient is φ = 177046480.

The previous prime is 194751077. The next prime is 194751157. The reversal of 194751139 is 931157491.

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

It is a cyclic number.

It is not a de Polignac number, because 194751139 - 2¹¹ = 194749091 is a prime.

It is a super-2 number, since 2×194751139² = 75856012283594642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194754139) 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, 8852314 + ... + 8852335.

It is an arithmetic number, because the mean of its divisors is an integer number (53113950).

Almost surely, 2^194751139 is an apocalyptic number.

194751139 is a deficient number, since it is larger than the sum of its proper divisors (17704661).

194751139 is a wasteful number, since it uses less digits than its factorization.

194751139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17704660.

The product of its digits is 34020, while the sum is 40.

The square root of 194751139 is about 13955.3265458032. The cubic root of 194751139 is about 579.6422079860.

The spelling of 194751139 in words is "one hundred ninety-four million, seven hundred fifty-one thousand, one hundred thirty-nine".