101201309981 has 2 divisors, whose sum is σ = 101201309982. Its totient is φ = 101201309980.

The previous prime is 101201309969. The next prime is 101201310071. The reversal of 101201309981 is 189903102101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64064165881 + 37137144100 = 253109^2 + 192710^2 .

It is a cyclic number.

It is not a de Polignac number, because 101201309981 - 2³⁰ = 100127568157 is a prime.

It is a super-2 number, since 2×101201309981² (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 (101201309921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50600654990 + 50600654991.

It is an arithmetic number, because the mean of its divisors is an integer number (50600654991).

Almost surely, 2^101201309981 is an apocalyptic number.

It is an amenable number.

101201309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

101201309981 is an equidigital number, since it uses as much as digits as its factorization.

101201309981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 101201309981 in words is "one hundred one billion, two hundred one million, three hundred nine thousand, nine hundred eighty-one".