100005380581 has 4 divisors (see below), whose sum is σ = 100069201792. Its totient is φ = 99941559372.

The previous prime is 100005380567. The next prime is 100005380591. The reversal of 100005380581 is 185083500001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185083500001 = 101 ⋅1832509901.

It is a cyclic number.

It is not a de Polignac number, because 100005380581 - 2³⁵ = 65645642213 is a prime.

It is a super-2 number, since 2×100005380581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100005380591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31908255 + ... + 31911388.

It is an arithmetic number, because the mean of its divisors is an integer number (25017300448).

Almost surely, 2^100005380581 is an apocalyptic number.

It is an amenable number.

100005380581 is a deficient number, since it is larger than the sum of its proper divisors (63821211).

100005380581 is an equidigital number, since it uses as much as digits as its factorization.

100005380581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63821210.

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 100005380581 its reverse (185083500001), we get a palindrome (285088880582).

The spelling of 100005380581 in words is "one hundred billion, five million, three hundred eighty thousand, five hundred eighty-one".