50170721 has 2 divisors, whose sum is σ = 50170722. Its totient is φ = 50170720.

The previous prime is 50170693. The next prime is 50170733. The reversal of 50170721 is 12707105.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35046400 + 15124321 = 5920^2 + 3889^2 .

It is a cyclic number.

It is not a de Polignac number, because 50170721 - 2¹⁰ = 50169697 is a prime.

It is not a weakly prime, because it can be changed into another prime (50170781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25085360 + 25085361.

It is an arithmetic number, because the mean of its divisors is an integer number (25085361).

Almost surely, 2^50170721 is an apocalyptic number.

It is an amenable number.

50170721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50170721 is an equidigital number, since it uses as much as digits as its factorization.

50170721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 50170721 is about 7083.1293225523. The cubic root of 50170721 is about 368.8219679125.

Adding to 50170721 its reverse (12707105), we get a palindrome (62877826).

The spelling of 50170721 in words is "fifty million, one hundred seventy thousand, seven hundred twenty-one".