11119999981 has 2 divisors, whose sum is σ = 11119999982. Its totient is φ = 11119999980.

The previous prime is 11119999973. The next prime is 11120000029. The reversal of 11119999981 is 18999991111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10375255881 + 744744100 = 101859^2 + 27290^2 .

It is a cyclic number.

It is not a de Polignac number, because 11119999981 - 2³ = 11119999973 is a prime.

It is a super-2 number, since 2×11119999981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11119999901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5559999990 + 5559999991.

It is an arithmetic number, because the mean of its divisors is an integer number (5559999991).

Almost surely, 2^11119999981 is an apocalyptic number.

It is an amenable number.

11119999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11119999981 is an equidigital number, since it uses as much as digits as its factorization.

11119999981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 58.

The spelling of 11119999981 in words is "eleven billion, one hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-one".