191345718373 has 2 divisors, whose sum is σ = 191345718374. Its totient is φ = 191345718372.

The previous prime is 191345718367. The next prime is 191345718407. The reversal of 191345718373 is 373817543191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102388480324 + 88957238049 = 319982^2 + 298257^2 .

It is a cyclic number.

It is not a de Polignac number, because 191345718373 - 2⁹ = 191345717861 is a prime.

It is a super-2 number, since 2×191345718373² (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 191345718373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191345718323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95672859186 + 95672859187.

It is an arithmetic number, because the mean of its divisors is an integer number (95672859187).

Almost surely, 2^191345718373 is an apocalyptic number.

It is an amenable number.

191345718373 is a deficient number, since it is larger than the sum of its proper divisors (1).

191345718373 is an equidigital number, since it uses as much as digits as its factorization.

191345718373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 52.

The spelling of 191345718373 in words is "one hundred ninety-one billion, three hundred forty-five million, seven hundred eighteen thousand, three hundred seventy-three".