133557123 has 16 divisors (see below), whose sum is σ = 203751680. Its totient is φ = 76229856.

The previous prime is 133557119. The next prime is 133557133. The reversal of 133557123 is 321755331.

It is not a de Polignac number, because 133557123 - 2² = 133557119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133557103) 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, 17748 + ... + 24126.

It is an arithmetic number, because the mean of its divisors is an integer number (12734480).

Almost surely, 2^133557123 is an apocalyptic number.

133557123 is a deficient number, since it is larger than the sum of its proper divisors (70194557).

133557123 is an equidigital number, since it uses as much as digits as its factorization.

133557123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7386.

The product of its digits is 9450, while the sum is 30.

The square root of 133557123 is about 11556.6916978866. The cubic root of 133557123 is about 511.1586153897.

The spelling of 133557123 in words is "one hundred thirty-three million, five hundred fifty-seven thousand, one hundred twenty-three".