49999999999981 has 2 divisors, whose sum is σ = 49999999999982. Its totient is φ = 49999999999980.

The previous prime is 49999999999949. The next prime is 50000000000053. The reversal of 49999999999981 is 18999999999994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37089927022500 + 12910072977481 = 6090150^2 + 3593059^2 .

It is a cyclic number.

It is not a de Polignac number, because 49999999999981 - 2⁵ = 49999999999949 is a prime.

It is a super-2 number, since 2×49999999999981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49999999999381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999999999990 + 24999999999991.

It is an arithmetic number, because the mean of its divisors is an integer number (24999999999991).

Almost surely, 2^{49999999999981} is an apocalyptic number.

It is an amenable number.

49999999999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49999999999981 is an equidigital number, since it uses as much as digits as its factorization.

49999999999981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1004193907488, while the sum is 112.

The spelling of 49999999999981 in words is "forty-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".