50143721 has 2 divisors, whose sum is σ = 50143722. Its totient is φ = 50143720.

The previous prime is 50143673. The next prime is 50143733. The reversal of 50143721 is 12734105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 11256025 = 6236^2 + 3355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50143721 is a prime.

It is not a weakly prime, because it can be changed into another prime (50143741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25071860 + 25071861.

It is an arithmetic number, because the mean of its divisors is an integer number (25071861).

Almost surely, 2^50143721 is an apocalyptic number.

It is an amenable number.

50143721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50143721 is an equidigital number, since it uses as much as digits as its factorization.

50143721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 50143721 is about 7081.2231288104. The cubic root of 50143721 is about 368.7557939911.

Adding to 50143721 its reverse (12734105), we get a palindrome (62877826).

The spelling of 50143721 in words is "fifty million, one hundred forty-three thousand, seven hundred twenty-one".