49805981 has 2 divisors, whose sum is σ = 49805982. Its totient is φ = 49805980.

The previous prime is 49805969. The next prime is 49805983. The reversal of 49805981 is 18950894.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42133081 + 7672900 = 6491^2 + 2770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49805981 is a prime.

It is a super-2 number, since 2×49805981² = 4961271486744722, which contains 22 as substring.

Together with 49805983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49805983) 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 as a sum of consecutive naturals, namely, 24902990 + 24902991.

It is an arithmetic number, because the mean of its divisors is an integer number (24902991).

Almost surely, 2^49805981 is an apocalyptic number.

It is an amenable number.

49805981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49805981 is an equidigital number, since it uses as much as digits as its factorization.

49805981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 49805981 is about 7057.3352619810. The cubic root of 49805981 is about 367.9260174409.

The spelling of 49805981 in words is "forty-nine million, eight hundred five thousand, nine hundred eighty-one".