191812022649 has 32 divisors (see below), whose sum is σ = 308434595840. Its totient is φ = 117108706176.

The previous prime is 191812022617. The next prime is 191812022687. The reversal of 191812022649 is 946220218191.

It is a happy number.

191812022649 is a `hidden beast` number, since 1 + 9 + 181 + 202 + 264 + 9 = 666.

191812022649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191812022649 - 2⁵ = 191812022617 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191812023649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2106892 + ... + 2196045.

It is an arithmetic number, because the mean of its divisors is an integer number (9638581120).

Almost surely, 2^191812022649 is an apocalyptic number.

It is an amenable number.

191812022649 is a deficient number, since it is larger than the sum of its proper divisors (116622573191).

191812022649 is a wasteful number, since it uses less digits than its factorization.

191812022649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303086 (or 4303080 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 191812022649 in words is "one hundred ninety-one billion, eight hundred twelve million, twenty-two thousand, six hundred forty-nine".