105123491 has 8 divisors (see below), whose sum is σ = 114816000. Its totient is φ = 95453640.

The previous prime is 105123481. The next prime is 105123493. The reversal of 105123491 is 194321501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105123491 - 2¹⁰ = 105122467 is a prime.

It is a super-2 number, since 2×105123491² = 22101896720054162, 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 105123491.

It is not an unprimeable number, because it can be changed into a prime (105123493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4910 + ... + 15308.

It is an arithmetic number, because the mean of its divisors is an integer number (14352000).

Almost surely, 2^105123491 is an apocalyptic number.

105123491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

105123491 is a deficient number, since it is larger than the sum of its proper divisors (9692509).

105123491 is a wasteful number, since it uses less digits than its factorization.

105123491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11329.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 105123491 is about 10252.9747390696. The cubic root of 105123491 is about 471.9542756506.

Adding to 105123491 its reverse (194321501), we get a palindrome (299444992).

It can be divided in two parts, 1051 and 23491, that added together give a palindrome (24542).

The spelling of 105123491 in words is "one hundred five million, one hundred twenty-three thousand, four hundred ninety-one".