100102081 has 2 divisors, whose sum is σ = 100102082. Its totient is φ = 100102080.

The previous prime is 100102073. The next prime is 100102129. The reversal of 100102081 is 180201001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65351056 + 34751025 = 8084^2 + 5895^2 .

It is an emirp because it is prime and its reverse (180201001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100102081 - 2³ = 100102073 is a prime.

It is a super-2 number, since 2×100102081² = 20040853241061122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100102021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50051040 + 50051041.

It is an arithmetic number, because the mean of its divisors is an integer number (50051041).

Almost surely, 2^100102081 is an apocalyptic number.

It is an amenable number.

100102081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100102081 is an equidigital number, since it uses as much as digits as its factorization.

100102081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 100102081 is about 10005.1027480981. The cubic root of 100102081 is about 464.3167689930.

Adding to 100102081 its reverse (180201001), we get a palindrome (280303082).

The spelling of 100102081 in words is "one hundred million, one hundred two thousand, eighty-one".