191936938069 has 4 divisors (see below), whose sum is σ = 191937816396. Its totient is φ = 191936059744.

The previous prime is 191936938043. The next prime is 191936938079. The reversal of 191936938069 is 960839639191.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 960839639191 = 41 ⋅23435113151.

It can be written as a sum of positive squares in 2 ways, for example, as 93113471025 + 98823467044 = 305145^2 + 314362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191936938069 is a prime.

It is a super-2 number, since 2×191936938069² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191936938069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191936938009) 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, 173907 + ... + 643519.

It is an arithmetic number, because the mean of its divisors is an integer number (47984454099).

Almost surely, 2^191936938069 is an apocalyptic number.

It is an amenable number.

191936938069 is a deficient number, since it is larger than the sum of its proper divisors (878327).

191936938069 is an equidigital number, since it uses as much as digits as its factorization.

191936938069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878326.

The product of its (nonzero) digits is 17006112, while the sum is 64.

The spelling of 191936938069 in words is "one hundred ninety-one billion, nine hundred thirty-six million, nine hundred thirty-eight thousand, sixty-nine".