119999999981 has 2 divisors, whose sum is σ = 119999999982. Its totient is φ = 119999999980.

The previous prime is 119999999963. The next prime is 120000000007. The reversal of 119999999981 is 189999999911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116806732900 + 3193267081 = 341770^2 + 56509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-119999999981 is a prime.

It is a super-2 number, since 2×119999999981² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 119999999981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (119999999921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59999999990 + 59999999991.

It is an arithmetic number, because the mean of its divisors is an integer number (59999999991).

Almost surely, 2^119999999981 is an apocalyptic number.

It is an amenable number.

119999999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

119999999981 is an equidigital number, since it uses as much as digits as its factorization.

119999999981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 344373768, while the sum is 83.

The spelling of 119999999981 in words is "one hundred nineteen billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".