191288912913 has 24 divisors (see below), whose sum is σ = 315819153728. Its totient is φ = 109293885792.

The previous prime is 191288912909. The next prime is 191288912921. The reversal of 191288912913 is 319219882191.

It is a happy number.

191288912913 is a `hidden beast` number, since 191 + 2 + 88 + 91 + 291 + 3 = 666.

It is not a de Polignac number, because 191288912913 - 2² = 191288912909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191288912913.

It is not an unprimeable number, because it can be changed into a prime (191288912993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308406 + ... + 691152.

Almost surely, 2^191288912913 is an apocalyptic number.

It is an amenable number.

191288912913 is a deficient number, since it is larger than the sum of its proper divisors (124530240815).

191288912913 is a wasteful number, since it uses less digits than its factorization.

191288912913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390693 (or 390690 counting only the distinct ones).

The product of its digits is 559872, while the sum is 54.

The spelling of 191288912913 in words is "one hundred ninety-one billion, two hundred eighty-eight million, nine hundred twelve thousand, nine hundred thirteen".