133540123 has 4 divisors (see below), whose sum is σ = 134722008. Its totient is φ = 132358240.

The previous prime is 133540103. The next prime is 133540177. The reversal of 133540123 is 321045331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133540123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133540094 and 133540103.

It is not an unprimeable number, because it can be changed into a prime (133540103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590773 + ... + 590998.

It is an arithmetic number, because the mean of its divisors is an integer number (33680502).

Almost surely, 2^133540123 is an apocalyptic number.

133540123 is a deficient number, since it is larger than the sum of its proper divisors (1181885).

133540123 is a wasteful number, since it uses less digits than its factorization.

133540123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181884.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 133540123 is about 11555.9561698719. The cubic root of 133540123 is about 511.1369266296.

Adding to 133540123 its reverse (321045331), we get a palindrome (454585454).

The spelling of 133540123 in words is "one hundred thirty-three million, five hundred forty thousand, one hundred twenty-three".