191993851934 has 4 divisors (see below), whose sum is σ = 287990777904. Its totient is φ = 95996925966.

The previous prime is 191993851909. The next prime is 191993851939. The reversal of 191993851934 is 439158399191.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191993851939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47998462982 + ... + 47998462985.

It is an arithmetic number, because the mean of its divisors is an integer number (71997694476).

Almost surely, 2^191993851934 is an apocalyptic number.

191993851934 is a deficient number, since it is larger than the sum of its proper divisors (95996925970).

191993851934 is an equidigital number, since it uses as much as digits as its factorization.

191993851934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95996925969.

The product of its digits is 9447840, while the sum is 62.

The spelling of 191993851934 in words is "one hundred ninety-one billion, nine hundred ninety-three million, eight hundred fifty-one thousand, nine hundred thirty-four".