133533553 has 8 divisors (see below), whose sum is σ = 137586600. Its totient is φ = 129537408.

The previous prime is 133533541. The next prime is 133533557. The reversal of 133533553 is 355335331.

It can be written as a sum of positive squares in 4 ways, for example, as 12027024 + 121506529 = 3468^2 + 11023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133533553 - 2⁹ = 133533041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133533557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9438 + ... + 18871.

It is an arithmetic number, because the mean of its divisors is an integer number (17198325).

Almost surely, 2^133533553 is an apocalyptic number.

It is an amenable number.

133533553 is a deficient number, since it is larger than the sum of its proper divisors (4053047).

133533553 is an equidigital number, since it uses as much as digits as its factorization.

133533553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28451.

The product of its digits is 30375, while the sum is 31.

The square root of 133533553 is about 11555.6718973844. The cubic root of 133533553 is about 511.1285440686.

Adding to 133533553 its reverse (355335331), we get a palindrome (488868884).

The spelling of 133533553 in words is "one hundred thirty-three million, five hundred thirty-three thousand, five hundred fifty-three".