105555389 has 4 divisors (see below), whose sum is σ = 109195260. Its totient is φ = 101915520.

The previous prime is 105555353. The next prime is 105555407. The reversal of 105555389 is 983555501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983555501 = 19 ⋅51766079.

It can be written as a sum of positive squares in 2 ways, for example, as 86806489 + 18748900 = 9317^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 105555389 - 2⁸ = 105555133 is a prime.

It is a super-2 number, since 2×105555389² = 22283880293882642, which 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 (105555889) 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, 1819892 + ... + 1819949.

It is an arithmetic number, because the mean of its divisors is an integer number (27298815).

Almost surely, 2^105555389 is an apocalyptic number.

It is an amenable number.

105555389 is a deficient number, since it is larger than the sum of its proper divisors (3639871).

105555389 is an equidigital number, since it uses as much as digits as its factorization.

105555389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639870.

The product of its (nonzero) digits is 135000, while the sum is 41.

The square root of 105555389 is about 10274.0152326148. The cubic root of 105555389 is about 472.5997311014.

The spelling of 105555389 in words is "one hundred five million, five hundred fifty-five thousand, three hundred eighty-nine".