49455781 has 2 divisors, whose sum is σ = 49455782. Its totient is φ = 49455780.

The previous prime is 49455779. The next prime is 49455869. The reversal of 49455781 is 18755494.

49455781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33535681 + 15920100 = 5791^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 49455781 - 2¹ = 49455779 is a prime.

It is a super-2 number, since 2×49455781² = 4891748548639922, which contains 22 as substring.

Together with 49455779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49450781) 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, 24727890 + 24727891.

It is an arithmetic number, because the mean of its divisors is an integer number (24727891).

Almost surely, 2^49455781 is an apocalyptic number.

It is an amenable number.

49455781 is a deficient number, since it is larger than the sum of its proper divisors (1).

49455781 is an equidigital number, since it uses as much as digits as its factorization.

49455781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 49455781 is about 7032.4804301185. The cubic root of 49455781 is about 367.0616576314.

The spelling of 49455781 in words is "forty-nine million, four hundred fifty-five thousand, seven hundred eighty-one".