50008991 has 2 divisors, whose sum is σ = 50008992. Its totient is φ = 50008990.

The previous prime is 50008979. The next prime is 50008993. The reversal of 50008991 is 19980005.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50008991 is a prime.

It is a super-3 number, since 3×50008991³ (a number of 24 digits) contains 333 as substring.

Together with 50008993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50008993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25004495 + 25004496.

It is an arithmetic number, because the mean of its divisors is an integer number (25004496).

Almost surely, 2^50008991 is an apocalyptic number.

50008991 is a deficient number, since it is larger than the sum of its proper divisors (1).

50008991 is an equidigital number, since it uses as much as digits as its factorization.

50008991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 50008991 is about 7071.7035429944. The cubic root of 50008991 is about 368.4252306254.

Adding to 50008991 its reverse (19980005), we get a palindrome (69988996).

The spelling of 50008991 in words is "fifty million, eight thousand, nine hundred ninety-one".