105534991 has 4 divisors (see below), whose sum is σ = 105976800. Its totient is φ = 105093184.

The previous prime is 105534967. The next prime is 105535009. The reversal of 105534991 is 199435501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105534991 - 2⁵ = 105534959 is a prime.

It is a super-2 number, since 2×105534991² = 22275268650740162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105534991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105534901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220546 + ... + 221023.

It is an arithmetic number, because the mean of its divisors is an integer number (26494200).

Almost surely, 2^105534991 is an apocalyptic number.

105534991 is a deficient number, since it is larger than the sum of its proper divisors (441809).

105534991 is an equidigital number, since it uses as much as digits as its factorization.

105534991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441808.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 105534991 is about 10273.0224861041. The cubic root of 105534991 is about 472.5692867049.

It can be divided in two parts, 1055 and 34991, that added together give a triangular number (36046 = T₂₆₈).

The spelling of 105534991 in words is "one hundred five million, five hundred thirty-four thousand, nine hundred ninety-one".