133424561 has 4 divisors (see below), whose sum is σ = 133773312. Its totient is φ = 133075812.

The previous prime is 133424539. The next prime is 133424569. The reversal of 133424561 is 165424331.

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: 165424331 = 17 ⋅9730843.

It is a cyclic number.

It is not a de Polignac number, because 133424561 - 2⁶ = 133424497 is a prime.

It is a super-2 number, since 2×133424561² = 35604226956085442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133424569) 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, 173801 + ... + 174566.

It is an arithmetic number, because the mean of its divisors is an integer number (33443328).

Almost surely, 2^133424561 is an apocalyptic number.

It is an amenable number.

133424561 is a deficient number, since it is larger than the sum of its proper divisors (348751).

133424561 is an equidigital number, since it uses as much as digits as its factorization.

133424561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348750.

The product of its digits is 8640, while the sum is 29.

The square root of 133424561 is about 11550.9549821649. The cubic root of 133424561 is about 510.9894427349.

Adding to 133424561 its reverse (165424331), we get a palindrome (298848892).

The spelling of 133424561 in words is "one hundred thirty-three million, four hundred twenty-four thousand, five hundred sixty-one".