30089999981 has 2 divisors, whose sum is σ = 30089999982. Its totient is φ = 30089999980.

The previous prime is 30089999939. The next prime is 30090000089. The reversal of 30089999981 is 18999998003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27201904900 + 2888095081 = 164930^2 + 53741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30089999981 is a prime.

It is a super-2 number, since 2×30089999981² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30089909981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15044999990 + 15044999991.

It is an arithmetic number, because the mean of its divisors is an integer number (15044999991).

Almost surely, 2^30089999981 is an apocalyptic number.

It is an amenable number.

30089999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30089999981 is an equidigital number, since it uses as much as digits as its factorization.

30089999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11337408, while the sum is 65.

The spelling of 30089999981 in words is "thirty billion, eighty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".