105123155 has 8 divisors (see below), whose sum is σ = 133568352. Its totient is φ = 79151488.

The previous prime is 105123127. The next prime is 105123157. The reversal of 105123155 is 551321501.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105123155 is a prime.

It is a super-2 number, since 2×105123155² = 22101755434308050, 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 105123155.

It is not an unprimeable number, because it can be changed into a prime (105123157) 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, 618287 + ... + 618456.

It is an arithmetic number, because the mean of its divisors is an integer number (16696044).

Almost surely, 2^105123155 is an apocalyptic number.

105123155 is a deficient number, since it is larger than the sum of its proper divisors (28445197).

105123155 is a wasteful number, since it uses less digits than its factorization.

105123155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236765.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 105123155 is about 10252.9583535680. The cubic root of 105123155 is about 471.9537728236.

Adding to 105123155 its reverse (551321501), we get a palindrome (656444656).

The spelling of 105123155 in words is "one hundred five million, one hundred twenty-three thousand, one hundred fifty-five".