100011010109581 has 2 divisors, whose sum is σ = 100011010109582. Its totient is φ = 100011010109580.

The previous prime is 100011010109539. The next prime is 100011010109597. The reversal of 100011010109581 is 185901010110001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99433803722500 + 577206387081 = 9971650^2 + 759741^2 .

It is an emirp because it is prime and its reverse (185901010110001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100011010109581 - 2¹³ = 100011010101389 is a prime.

It is a super-2 number, since 2×100011010109581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100011010101581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50005505054790 + 50005505054791.

It is an arithmetic number, because the mean of its divisors is an integer number (50005505054791).

Almost surely, 2^{100011010109581} is an apocalyptic number.

It is an amenable number.

100011010109581 is a deficient number, since it is larger than the sum of its proper divisors (1).

100011010109581 is an equidigital number, since it uses as much as digits as its factorization.

100011010109581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 28.

Adding to 100011010109581 its reverse (185901010110001), we get a palindrome (285912020219582).

The spelling of 100011010109581 in words is "one hundred trillion, eleven billion, ten million, one hundred nine thousand, five hundred eighty-one".