50999991 has 16 divisors (see below), whose sum is σ = 80222208. Its totient is φ = 28202400.

The previous prime is 50999989. The next prime is 50999999. The reversal of 50999991 is 19999905.

50999991 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 50999991 - 2¹ = 50999989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50999999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38520 + ... + 39821.

It is an arithmetic number, because the mean of its divisors is an integer number (5013888).

Almost surely, 2^50999991 is an apocalyptic number.

50999991 is a deficient number, since it is larger than the sum of its proper divisors (29222217).

50999991 is a wasteful number, since it uses less digits than its factorization.

50999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78382.

The product of its (nonzero) digits is 295245, while the sum is 51.

The square root of 50999991 is about 7141.4277984168. The cubic root of 50999991 is about 370.8429551123.

The spelling of 50999991 in words is "fifty million, nine hundred ninety-nine thousand, nine hundred ninety-one".