50920721 has 2 divisors, whose sum is σ = 50920722. Its totient is φ = 50920720.

The previous prime is 50920699. The next prime is 50920733. The reversal of 50920721 is 12702905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 17106496 = 5815^2 + 4136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50920721 is a prime.

It is not a weakly prime, because it can be changed into another prime (50920921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25460360 + 25460361.

It is an arithmetic number, because the mean of its divisors is an integer number (25460361).

Almost surely, 2^50920721 is an apocalyptic number.

It is an amenable number.

50920721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50920721 is an equidigital number, since it uses as much as digits as its factorization.

50920721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 50920721 is about 7135.8756295216. The cubic root of 50920721 is about 370.6507200144.

The spelling of 50920721 in words is "fifty million, nine hundred twenty thousand, seven hundred twenty-one".