50811391 has 2 divisors, whose sum is σ = 50811392. Its totient is φ = 50811390.

The previous prime is 50811389. The next prime is 50811401. The reversal of 50811391 is 19311805.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 50811391 - 2¹ = 50811389 is a prime.

Together with 50811389, it forms a pair of twin primes.

It is a zygodrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50811361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25405695 + 25405696.

It is an arithmetic number, because the mean of its divisors is an integer number (25405696).

Almost surely, 2^50811391 is an apocalyptic number.

50811391 is a deficient number, since it is larger than the sum of its proper divisors (1).

50811391 is an equidigital number, since it uses as much as digits as its factorization.

50811391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 50811391 is about 7128.2109256110. The cubic root of 50811391 is about 370.3852597783.

The spelling of 50811391 in words is "fifty million, eight hundred eleven thousand, three hundred ninety-one".