100538639081 has 4 divisors (see below), whose sum is σ = 106452676692. Its totient is φ = 94624601472.

The previous prime is 100538639077. The next prime is 100538639087. The reversal of 100538639081 is 180936835001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40288518400 + 60250120681 = 200720^2 + 245459^2 .

It is a cyclic number.

It is not a de Polignac number, because 100538639081 - 2² = 100538639077 is a prime.

It is a super-2 number, since 2×100538639081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100538639087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2957018780 + ... + 2957018813.

It is an arithmetic number, because the mean of its divisors is an integer number (26613169173).

Almost surely, 2^100538639081 is an apocalyptic number.

It is an amenable number.

100538639081 is a deficient number, since it is larger than the sum of its proper divisors (5914037611).

100538639081 is an equidigital number, since it uses as much as digits as its factorization.

100538639081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5914037610.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 100538639081 in words is "one hundred billion, five hundred thirty-eight million, six hundred thirty-nine thousand, eighty-one".