49909813 has 2 divisors, whose sum is σ = 49909814. Its totient is φ = 49909812.

The previous prime is 49909801. The next prime is 49909819. The reversal of 49909813 is 31890994.

49909813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44116164 + 5793649 = 6642^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 49909813 - 2¹⁷ = 49778741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49909813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49909819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24954906 + 24954907.

It is an arithmetic number, because the mean of its divisors is an integer number (24954907).

Almost surely, 2^49909813 is an apocalyptic number.

It is an amenable number.

49909813 is a deficient number, since it is larger than the sum of its proper divisors (1).

49909813 is an equidigital number, since it uses as much as digits as its factorization.

49909813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 49909813 is about 7064.6877496461. The cubic root of 49909813 is about 368.1815153877.

The spelling of 49909813 in words is "forty-nine million, nine hundred nine thousand, eight hundred thirteen".