49853781181 has 4 divisors (see below), whose sum is σ = 50217677532. Its totient is φ = 49489884832.

The previous prime is 49853781149. The next prime is 49853781209. The reversal of 49853781181 is 18118735894.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40515651225 + 9338129956 = 201285^2 + 96634^2 .

It is a cyclic number.

It is not a de Polignac number, because 49853781181 - 2⁵ = 49853781149 is a prime.

It is a super-2 number, since 2×49853781181² (a number of 22 digits) 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 (49853781581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181947970 + ... + 181948243.

It is an arithmetic number, because the mean of its divisors is an integer number (12554419383).

Almost surely, 2^49853781181 is an apocalyptic number.

It is an amenable number.

49853781181 is a deficient number, since it is larger than the sum of its proper divisors (363896351).

49853781181 is a wasteful number, since it uses less digits than its factorization.

49853781181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363896350.

The product of its digits is 1935360, while the sum is 55.

The spelling of 49853781181 in words is "forty-nine billion, eight hundred fifty-three million, seven hundred eighty-one thousand, one hundred eighty-one".