50821957 has 4 divisors (see below), whose sum is σ = 50878656. Its totient is φ = 50765260.

The previous prime is 50821921. The next prime is 50821997. The reversal of 50821957 is 75912805.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75912805 = 5 ⋅15182561.

It is a cyclic number.

It is not a de Polignac number, because 50821957 - 2¹⁹ = 50297669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50821907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26983 + ... + 28804.

It is an arithmetic number, because the mean of its divisors is an integer number (12719664).

Almost surely, 2^50821957 is an apocalyptic number.

It is an amenable number.

50821957 is a deficient number, since it is larger than the sum of its proper divisors (56699).

50821957 is an equidigital number, since it uses as much as digits as its factorization.

50821957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56698.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 50821957 is about 7128.9520267708. The cubic root of 50821957 is about 370.4109313147.

The spelling of 50821957 in words is "fifty million, eight hundred twenty-one thousand, nine hundred fifty-seven".