30011644981 has 4 divisors (see below), whose sum is σ = 30743636364. Its totient is φ = 29279653600.

The previous prime is 30011644979. The next prime is 30011645029. The reversal of 30011644981 is 18944611003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18944611003 = 41 ⋅462063683.

It can be written as a sum of positive squares in 2 ways, for example, as 5171048100 + 24840596881 = 71910^2 + 157609^2 .

It is a cyclic number.

It is not a de Polignac number, because 30011644981 - 2¹ = 30011644979 is a prime.

It is a super-2 number, since 2×30011644981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30011644981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30011645981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365995630 + ... + 365995711.

It is an arithmetic number, because the mean of its divisors is an integer number (7685909091).

Almost surely, 2^30011644981 is an apocalyptic number.

It is an amenable number.

30011644981 is a deficient number, since it is larger than the sum of its proper divisors (731991383).

30011644981 is an equidigital number, since it uses as much as digits as its factorization.

30011644981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731991382.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 30011644981 in words is "thirty billion, eleven million, six hundred forty-four thousand, nine hundred eighty-one".