50172391 has 2 divisors, whose sum is σ = 50172392. Its totient is φ = 50172390.

The previous prime is 50172379. The next prime is 50172427. The reversal of 50172391 is 19327105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 50172391 - 2⁷ = 50172263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50172301) 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, 25086195 + 25086196.

It is an arithmetic number, because the mean of its divisors is an integer number (25086196).

Almost surely, 2^50172391 is an apocalyptic number.

50172391 is a deficient number, since it is larger than the sum of its proper divisors (1).

50172391 is an equidigital number, since it uses as much as digits as its factorization.

50172391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 50172391 is about 7083.2472073195. The cubic root of 50172391 is about 368.8260601124.

Adding to 50172391 its reverse (19327105), we get a palindrome (69499496).

The spelling of 50172391 in words is "fifty million, one hundred seventy-two thousand, three hundred ninety-one".