49057721 has 2 divisors, whose sum is σ = 49057722. Its totient is φ = 49057720.

The previous prime is 49057693. The next prime is 49057769. The reversal of 49057721 is 12775094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48846121 + 211600 = 6989^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 49057721 - 2¹⁸ = 48795577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42057721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24528860 + 24528861.

It is an arithmetic number, because the mean of its divisors is an integer number (24528861).

Almost surely, 2^49057721 is an apocalyptic number.

It is an amenable number.

49057721 is a deficient number, since it is larger than the sum of its proper divisors (1).

49057721 is an equidigital number, since it uses as much as digits as its factorization.

49057721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 49057721 is about 7004.1217151046. The cubic root of 49057721 is about 366.0742008676.

The spelling of 49057721 in words is "forty-nine million, fifty-seven thousand, seven hundred twenty-one".