100101010981 has 2 divisors, whose sum is σ = 100101010982. Its totient is φ = 100101010980.

The previous prime is 100101010951. The next prime is 100101011069. The reversal of 100101010981 is 189010101001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61806434881 + 38294576100 = 248609^2 + 195690^2 .

It is an emirp because it is prime and its reverse (189010101001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100101010981 - 2¹¹ = 100101008933 is a prime.

It is a super-2 number, since 2×100101010981² (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 (100101010901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050505490 + 50050505491.

It is an arithmetic number, because the mean of its divisors is an integer number (50050505491).

Almost surely, 2^100101010981 is an apocalyptic number.

It is an amenable number.

100101010981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100101010981 is an equidigital number, since it uses as much as digits as its factorization.

100101010981 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 22.

Adding to 100101010981 its reverse (189010101001), we get a palindrome (289111111982).

The spelling of 100101010981 in words is "one hundred billion, one hundred one million, ten thousand, nine hundred eighty-one".