191451617312 has 24 divisors (see below), whose sum is σ = 376931677500. Its totient is φ = 95722937344.

The previous prime is 191451617311. The next prime is 191451617323. The reversal of 191451617312 is 213716154191.

It can be written as a sum of positive squares in 2 ways, for example, as 158241657616 + 33209959696 = 397796^2 + 182236^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 191451617312.

It is not an unprimeable number, because it can be changed into a prime (191451617311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1348364 + ... + 1483572.

Almost surely, 2^191451617312 is an apocalyptic number.

It is an amenable number.

191451617312 is a deficient number, since it is larger than the sum of its proper divisors (185480060188).

191451617312 is a wasteful number, since it uses less digits than its factorization.

191451617312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179468 (or 179460 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The spelling of 191451617312 in words is "one hundred ninety-one billion, four hundred fifty-one million, six hundred seventeen thousand, three hundred twelve".