50557721 has 2 divisors, whose sum is σ = 50557722. Its totient is φ = 50557720.

The previous prime is 50557699. The next prime is 50557729. The reversal of 50557721 is 12775505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40704400 + 9853321 = 6380^2 + 3139^2 .

It is a cyclic number.

It is not a de Polignac number, because 50557721 - 2¹⁰ = 50556697 is a prime.

It is not a weakly prime, because it can be changed into another prime (50557729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25278860 + 25278861.

It is an arithmetic number, because the mean of its divisors is an integer number (25278861).

Almost surely, 2^50557721 is an apocalyptic number.

It is an amenable number.

50557721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50557721 is an equidigital number, since it uses as much as digits as its factorization.

50557721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 50557721 is about 7110.3952773387. The cubic root of 50557721 is about 369.7678626665.

The spelling of 50557721 in words is "fifty million, five hundred fifty-seven thousand, seven hundred twenty-one".