133442431 has 4 divisors (see below), whose sum is σ = 134179864. Its totient is φ = 132705000.

The previous prime is 133442429. The next prime is 133442437. The reversal of 133442431 is 134244331.

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

It is a cyclic number.

It is not a de Polignac number, because 133442431 - 2¹ = 133442429 is a prime.

It is a super-2 number, since 2×133442431² = 35613764782379522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133442396 and 133442405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133442437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368445 + ... + 368806.

It is an arithmetic number, because the mean of its divisors is an integer number (33544966).

Almost surely, 2^133442431 is an apocalyptic number.

133442431 is a deficient number, since it is larger than the sum of its proper divisors (737433).

133442431 is an equidigital number, since it uses as much as digits as its factorization.

133442431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737432.

The product of its digits is 3456, while the sum is 25.

The square root of 133442431 is about 11551.7284853826. The cubic root of 133442431 is about 511.0122545611.

Adding to 133442431 its reverse (134244331), we get a palindrome (267686762).

The spelling of 133442431 in words is "one hundred thirty-three million, four hundred forty-two thousand, four hundred thirty-one".