23003111981 has 2 divisors, whose sum is σ = 23003111982. Its totient is φ = 23003111980.

The previous prime is 23003111977. The next prime is 23003112043. The reversal of 23003111981 is 18911130032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19654638025 + 3348473956 = 140195^2 + 57866^2 .

It is a cyclic number.

It is not a de Polignac number, because 23003111981 - 2² = 23003111977 is a prime.

It is a super-2 number, since 2×23003111981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23003111581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11501555990 + 11501555991.

It is an arithmetic number, because the mean of its divisors is an integer number (11501555991).

Almost surely, 2^23003111981 is an apocalyptic number.

It is an amenable number.

23003111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23003111981 is an equidigital number, since it uses as much as digits as its factorization.

23003111981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 23003111981 in words is "twenty-three billion, three million, one hundred eleven thousand, nine hundred eighty-one".