49789186891 has 4 divisors (see below), whose sum is σ = 49919185152. Its totient is φ = 49659188632.

The previous prime is 49789186873. The next prime is 49789186907. The reversal of 49789186891 is 19868198794.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19868198794 = 2 ⋅9934099397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49789186891 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 49789186891.

It is not an unprimeable number, because it can be changed into a prime (49789186841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64998556 + ... + 64999321.

It is an arithmetic number, because the mean of its divisors is an integer number (12479796288).

Almost surely, 2^49789186891 is an apocalyptic number.

49789186891 is a deficient number, since it is larger than the sum of its proper divisors (129998261).

49789186891 is a wasteful number, since it uses less digits than its factorization.

49789186891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129998260.

The product of its digits is 62705664, while the sum is 70.

The spelling of 49789186891 in words is "forty-nine billion, seven hundred eighty-nine million, one hundred eighty-six thousand, eight hundred ninety-one".