191888747723 has 2 divisors, whose sum is σ = 191888747724. Its totient is φ = 191888747722.

The previous prime is 191888747689. The next prime is 191888747819. The reversal of 191888747723 is 327747888191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191888747723 is a prime.

It is a super-2 number, since 2×191888747723² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191888747723.

It is not a weakly prime, because it can be changed into another prime (191888743723) 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 as a sum of consecutive naturals, namely, 95944373861 + 95944373862.

It is an arithmetic number, because the mean of its divisors is an integer number (95944373862).

Almost surely, 2^191888747723 is an apocalyptic number.

191888747723 is a deficient number, since it is larger than the sum of its proper divisors (1).

191888747723 is an equidigital number, since it uses as much as digits as its factorization.

191888747723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37933056, while the sum is 65.

The spelling of 191888747723 in words is "one hundred ninety-one billion, eight hundred eighty-eight million, seven hundred forty-seven thousand, seven hundred twenty-three".