133123142 has 4 divisors (see below), whose sum is σ = 199684716. Its totient is φ = 66561570.

The previous prime is 133123099. The next prime is 133123157. The reversal of 133123142 is 241321331.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280784 + ... + 33280787.

It is an arithmetic number, because the mean of its divisors is an integer number (49921179).

Almost surely, 2^133123142 is an apocalyptic number.

133123142 is a deficient number, since it is larger than the sum of its proper divisors (66561574).

133123142 is an equidigital number, since it uses as much as digits as its factorization.

133123142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66561573.

The product of its digits is 432, while the sum is 20.

The square root of 133123142 is about 11537.9002422451. The cubic root of 133123142 is about 510.6043610704.

Adding to 133123142 its reverse (241321331), we get a palindrome (374444473).

The spelling of 133123142 in words is "one hundred thirty-three million, one hundred twenty-three thousand, one hundred forty-two".