105861539523 has 4 divisors (see below), whose sum is σ = 141148719368. Its totient is φ = 70574359680.

The previous prime is 105861539521. The next prime is 105861539533. The reversal of 105861539523 is 325935168501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325935168501 = 3 ⋅108645056167.

It is not a de Polignac number, because 105861539523 - 2¹ = 105861539521 is a prime.

It is a super-2 number, since 2×105861539523² (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 (105861539521) 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, 17643589918 + ... + 17643589923.

It is an arithmetic number, because the mean of its divisors is an integer number (35287179842).

Almost surely, 2^105861539523 is an apocalyptic number.

105861539523 is a deficient number, since it is larger than the sum of its proper divisors (35287179845).

105861539523 is an equidigital number, since it uses as much as digits as its factorization.

105861539523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35287179844.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 105861539523 in words is "one hundred five billion, eight hundred sixty-one million, five hundred thirty-nine thousand, five hundred twenty-three".