133564451 has 4 divisors (see below), whose sum is σ = 134539512. Its totient is φ = 132589392.

The previous prime is 133564439. The next prime is 133564481. The reversal of 133564451 is 154465331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154465331 = 43 ⋅3592217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133564451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133564481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487325 + ... + 487598.

It is an arithmetic number, because the mean of its divisors is an integer number (33634878).

Almost surely, 2^133564451 is an apocalyptic number.

133564451 is a deficient number, since it is larger than the sum of its proper divisors (975061).

133564451 is an equidigital number, since it uses as much as digits as its factorization.

133564451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975060.

The product of its digits is 21600, while the sum is 32.

The square root of 133564451 is about 11557.0087392889. The cubic root of 133564451 is about 511.1679639534.

The spelling of 133564451 in words is "one hundred thirty-three million, five hundred sixty-four thousand, four hundred fifty-one".