133530123 has 16 divisors (see below), whose sum is σ = 185882400. Its totient is φ = 85155840.

The previous prime is 133530109. The next prime is 133530139. The reversal of 133530123 is 321035331.

It is not a de Polignac number, because 133530123 - 2⁴ = 133530107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133530123.

It is not an unprimeable number, because it can be changed into a prime (133530143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2443 + ... + 16523.

It is an arithmetic number, because the mean of its divisors is an integer number (11617650).

Almost surely, 2^133530123 is an apocalyptic number.

133530123 is a deficient number, since it is larger than the sum of its proper divisors (52352277).

133530123 is a wasteful number, since it uses less digits than its factorization.

133530123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14222.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 133530123 is about 11555.5234844640. The cubic root of 133530123 is about 511.1241676756.

Adding to 133530123 its reverse (321035331), we get a palindrome (454565454).

The spelling of 133530123 in words is "one hundred thirty-three million, five hundred thirty thousand, one hundred twenty-three".