1553105123 has 4 divisors (see below), whose sum is σ = 1553721288. Its totient is φ = 1552488960.

The previous prime is 1553105111. The next prime is 1553105137. The reversal of 1553105123 is 3215013551.

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 1553105123 - 2³⁰ = 479363299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1553105092 and 1553105101.

It is not an unprimeable number, because it can be changed into a prime (1553107123) 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, 304286 + ... + 309347.

It is an arithmetic number, because the mean of its divisors is an integer number (388430322).

Almost surely, 2^1553105123 is an apocalyptic number.

1553105123 is a deficient number, since it is larger than the sum of its proper divisors (616165).

1553105123 is an equidigital number, since it uses as much as digits as its factorization.

1553105123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616164.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1553105123 is about 39409.4547412166. The cubic root of 1553105123 is about 1158.0668164818.

Adding to 1553105123 its reverse (3215013551), we get a palindrome (4768118674).

The spelling of 1553105123 in words is "one billion, five hundred fifty-three million, one hundred five thousand, one hundred twenty-three".