49519721 has 2 divisors, whose sum is σ = 49519722. Its totient is φ = 49519720.

The previous prime is 49519711. The next prime is 49519751. The reversal of 49519721 is 12791594.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 3279721 = 6800^2 + 1811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49519721 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 (49519711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24759860 + 24759861.

It is an arithmetic number, because the mean of its divisors is an integer number (24759861).

Almost surely, 2^49519721 is an apocalyptic number.

It is an amenable number.

49519721 is a deficient number, since it is larger than the sum of its proper divisors (1).

49519721 is an equidigital number, since it uses as much as digits as its factorization.

49519721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 49519721 is about 7037.0250106135. The cubic root of 49519721 is about 367.2197774348.

The spelling of 49519721 in words is "forty-nine million, five hundred nineteen thousand, seven hundred twenty-one".