194328139331 has 4 divisors (see below), whose sum is σ = 194904781032. Its totient is φ = 193751497632.

The previous prime is 194328139321. The next prime is 194328139399. The reversal of 194328139331 is 133931823491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133931823491 = 227 ⋅590008033.

It is a cyclic number.

It is not a de Polignac number, because 194328139331 - 2¹⁸ = 194327877187 is a prime.

It is a super-2 number, since 2×194328139331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194328139321) 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, 288320345 + ... + 288321018.

It is an arithmetic number, because the mean of its divisors is an integer number (48726195258).

Almost surely, 2^194328139331 is an apocalyptic number.

194328139331 is a deficient number, since it is larger than the sum of its proper divisors (576641701).

194328139331 is an equidigital number, since it uses as much as digits as its factorization.

194328139331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576641700.

The product of its digits is 419904, while the sum is 47.

The spelling of 194328139331 in words is "one hundred ninety-four billion, three hundred twenty-eight million, one hundred thirty-nine thousand, three hundred thirty-one".