49782181 has 2 divisors, whose sum is σ = 49782182. Its totient is φ = 49782180.

The previous prime is 49782179. The next prime is 49782203. The reversal of 49782181 is 18128794.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49126081 + 656100 = 7009^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 49782181 - 2¹ = 49782179 is a prime.

It is a super-2 number, since 2×49782181² = 4956531090233522, which contains 22 as substring.

Together with 49782179, it forms a pair of twin primes.

It is equal to p_2988823 and since 49782181 and 2988823 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49782581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24891090 + 24891091.

It is an arithmetic number, because the mean of its divisors is an integer number (24891091).

Almost surely, 2^49782181 is an apocalyptic number.

It is an amenable number.

49782181 is a deficient number, since it is larger than the sum of its proper divisors (1).

49782181 is an equidigital number, since it uses as much as digits as its factorization.

49782181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 49782181 is about 7055.6488716489. The cubic root of 49782181 is about 367.8674030991.

The spelling of 49782181 in words is "forty-nine million, seven hundred eighty-two thousand, one hundred eighty-one".