191451617323 has 2 divisors, whose sum is σ = 191451617324. Its totient is φ = 191451617322.

The previous prime is 191451617311. The next prime is 191451617339. The reversal of 191451617323 is 323716154191.

It is a weak prime.

It is an emirp because it is prime and its reverse (323716154191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191451617323 is a prime.

It is a super-3 number, since 3×191451617323³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191451617323.

It is not a weakly prime, because it can be changed into another prime (191451615323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95725808661 + 95725808662.

It is an arithmetic number, because the mean of its divisors is an integer number (95725808662).

Almost surely, 2^191451617323 is an apocalyptic number.

191451617323 is a deficient number, since it is larger than the sum of its proper divisors (1).

191451617323 is an equidigital number, since it uses as much as digits as its factorization.

191451617323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The spelling of 191451617323 in words is "one hundred ninety-one billion, four hundred fifty-one million, six hundred seventeen thousand, three hundred twenty-three".