123143553 has 24 divisors (see below), whose sum is σ = 191940840. Its totient is φ = 75628800.

The previous prime is 123143551. The next prime is 123143557. The reversal of 123143553 is 355341321.

It can be written as a sum of positive squares in 4 ways, for example, as 199809 + 122943744 = 447^2 + 11088^2 .

It is not a de Polignac number, because 123143553 - 2¹ = 123143551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123143551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94003 + ... + 95303.

It is an arithmetic number, because the mean of its divisors is an integer number (7997535).

Almost surely, 2^123143553 is an apocalyptic number.

123143553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123143553 is a deficient number, since it is larger than the sum of its proper divisors (68797287).

123143553 is a wasteful number, since it uses less digits than its factorization.

123143553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129 (or 2126 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 123143553 is about 11097.0064882382. The cubic root of 123143553 is about 497.5123813657.

Adding to 123143553 its reverse (355341321), we get a palindrome (478484874).

The spelling of 123143553 in words is "one hundred twenty-three million, one hundred forty-three thousand, five hundred fifty-three".