101010011981 has 2 divisors, whose sum is σ = 101010011982. Its totient is φ = 101010011980.

The previous prime is 101010011941. The next prime is 101010012011. The reversal of 101010011981 is 189110010101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68649240100 + 32360771881 = 262010^2 + 179891^2 .

It is a cyclic number.

It is not a de Polignac number, because 101010011981 - 2⁶ = 101010011917 is a prime.

It is a super-2 number, since 2×101010011981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101010011941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50505005990 + 50505005991.

It is an arithmetic number, because the mean of its divisors is an integer number (50505005991).

Almost surely, 2^101010011981 is an apocalyptic number.

It is an amenable number.

101010011981 is a deficient number, since it is larger than the sum of its proper divisors (1).

101010011981 is an equidigital number, since it uses as much as digits as its factorization.

101010011981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 23.

The spelling of 101010011981 in words is "one hundred one billion, ten million, eleven thousand, nine hundred eighty-one".