49447781 has 8 divisors (see below), whose sum is σ = 53345304. Its totient is φ = 45660160.

The previous prime is 49447771. The next prime is 49447793. The reversal of 49447781 is 18774494.

49447781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6806881 + 42640900 = 2609^2 + 6530^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49447781 is a prime.

It is a super-2 number, since 2×49447781² = 4890166091647922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49447771) 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 in 7 ways as a sum of consecutive naturals, for example, 26540 + ... + 28341.

It is an arithmetic number, because the mean of its divisors is an integer number (6668163).

Almost surely, 2^49447781 is an apocalyptic number.

It is an amenable number.

49447781 is a deficient number, since it is larger than the sum of its proper divisors (3897523).

49447781 is a wasteful number, since it uses less digits than its factorization.

49447781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54951.

The product of its digits is 225792, while the sum is 44.

The square root of 49447781 is about 7031.9116177608. The cubic root of 49447781 is about 367.0418645182.

The spelling of 49447781 in words is "forty-nine million, four hundred forty-seven thousand, seven hundred eighty-one".