105717861491 has 4 divisors (see below), whose sum is σ = 115328576184. Its totient is φ = 96107146800.

The previous prime is 105717861481. The next prime is 105717861521. The reversal of 105717861491 is 194168717501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194168717501 = 11 ⋅17651701591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105717861491 is a prime.

It is a super-2 number, since 2×105717861491² (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 (105717861401) 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, 4805357330 + ... + 4805357351.

It is an arithmetic number, because the mean of its divisors is an integer number (28832144046).

Almost surely, 2^105717861491 is an apocalyptic number.

105717861491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

105717861491 is a deficient number, since it is larger than the sum of its proper divisors (9610714693).

105717861491 is an equidigital number, since it uses as much as digits as its factorization.

105717861491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9610714692.

The product of its (nonzero) digits is 423360, while the sum is 50.

The spelling of 105717861491 in words is "one hundred five billion, seven hundred seventeen million, eight hundred sixty-one thousand, four hundred ninety-one".