50721757 has 2 divisors, whose sum is σ = 50721758. Its totient is φ = 50721756.

The previous prime is 50721743. The next prime is 50721767. The reversal of 50721757 is 75712705.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47969476 + 2752281 = 6926^2 + 1659^2 .

It is a cyclic number.

It is not a de Polignac number, because 50721757 - 2¹¹ = 50719709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50721707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25360878 + 25360879.

It is an arithmetic number, because the mean of its divisors is an integer number (25360879).

Almost surely, 2^50721757 is an apocalyptic number.

It is an amenable number.

50721757 is a deficient number, since it is larger than the sum of its proper divisors (1).

50721757 is an equidigital number, since it uses as much as digits as its factorization.

50721757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17150, while the sum is 34.

The square root of 50721757 is about 7121.9208785271. The cubic root of 50721757 is about 370.1673384780.

The spelling of 50721757 in words is "fifty million, seven hundred twenty-one thousand, seven hundred fifty-seven".