191338971123 has 32 divisors (see below), whose sum is σ = 268676001792. Its totient is φ = 120886365600.

The previous prime is 191338971107. The next prime is 191338971137. The reversal of 191338971123 is 321179833191.

It is a happy number.

It is not a de Polignac number, because 191338971123 - 2⁴ = 191338971107 is a prime.

It is a super-2 number, since 2×191338971123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191338971163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5686836 + ... + 5720382.

It is an arithmetic number, because the mean of its divisors is an integer number (8396125056).

Almost surely, 2^191338971123 is an apocalyptic number.

191338971123 is a deficient number, since it is larger than the sum of its proper divisors (77337030669).

191338971123 is a wasteful number, since it uses less digits than its factorization.

191338971123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34335.

The product of its digits is 244944, while the sum is 48.

The spelling of 191338971123 in words is "one hundred ninety-one billion, three hundred thirty-eight million, nine hundred seventy-one thousand, one hundred twenty-three".