133242433 has 4 divisors (see below), whose sum is σ = 137540608. Its totient is φ = 128944260.

The previous prime is 133242407. The next prime is 133242437. The reversal of 133242433 is 334242331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 334242331 = 643 ⋅519817.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133242433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133242398 and 133242407.

It is not an unprimeable number, because it can be changed into a prime (133242437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2149041 + ... + 2149102.

It is an arithmetic number, because the mean of its divisors is an integer number (34385152).

Almost surely, 2^133242433 is an apocalyptic number.

It is an amenable number.

133242433 is a deficient number, since it is larger than the sum of its proper divisors (4298175).

133242433 is an equidigital number, since it uses as much as digits as its factorization.

133242433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298174.

The product of its digits is 5184, while the sum is 25.

The square root of 133242433 is about 11543.0686128083. The cubic root of 133242433 is about 510.7568322313.

Adding to 133242433 its reverse (334242331), we get a palindrome (467484764).

The spelling of 133242433 in words is "one hundred thirty-three million, two hundred forty-two thousand, four hundred thirty-three".