50191989 has 4 divisors (see below), whose sum is σ = 66922656. Its totient is φ = 33461324.

The previous prime is 50191987. The next prime is 50191997. The reversal of 50191989 is 98919105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 50191989 - 2¹ = 50191987 is a prime.

It is a super-2 number, since 2×50191989² = 5038471519552242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 50191989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50191987) 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 3 ways as a sum of consecutive naturals, for example, 8365329 + ... + 8365334.

It is an arithmetic number, because the mean of its divisors is an integer number (16730664).

Almost surely, 2^50191989 is an apocalyptic number.

It is an amenable number.

50191989 is a deficient number, since it is larger than the sum of its proper divisors (16730667).

50191989 is a wasteful number, since it uses less digits than its factorization.

50191989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16730666.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 50191989 is about 7084.6304773079. The cubic root of 50191989 is about 368.8740766412.

The spelling of 50191989 in words is "fifty million, one hundred ninety-one thousand, nine hundred eighty-nine".