49851763981 has 2 divisors, whose sum is σ = 49851763982. Its totient is φ = 49851763980.

The previous prime is 49851763979. The next prime is 49851763987. The reversal of 49851763981 is 18936715894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44658255625 + 5193508356 = 211325^2 + 72066^2 .

It is a cyclic number.

It is not a de Polignac number, because 49851763981 - 2¹ = 49851763979 is a prime.

It is a super-2 number, since 2×49851763981² (a number of 22 digits) contains 22 as substring.

Together with 49851763979, 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 (49851763987) 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, 24925881990 + 24925881991.

It is an arithmetic number, because the mean of its divisors is an integer number (24925881991).

Almost surely, 2^49851763981 is an apocalyptic number.

It is an amenable number.

49851763981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49851763981 is an equidigital number, since it uses as much as digits as its factorization.

49851763981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 61.

The spelling of 49851763981 in words is "forty-nine billion, eight hundred fifty-one million, seven hundred sixty-three thousand, nine hundred eighty-one".