133533517 has 4 divisors (see below), whose sum is σ = 143805340. Its totient is φ = 123261696.

The previous prime is 133533503. The next prime is 133533541. The reversal of 133533517 is 715335331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715335331 = 1231 ⋅581101.

It can be written as a sum of positive squares in 2 ways, for example, as 52911076 + 80622441 = 7274^2 + 8979^2 .

It is a cyclic number.

It is not a de Polignac number, because 133533517 - 2¹⁹ = 133009229 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 5135892 + ... + 5135917.

It is an arithmetic number, because the mean of its divisors is an integer number (35951335).

Almost surely, 2^133533517 is an apocalyptic number.

It is an amenable number.

133533517 is a deficient number, since it is larger than the sum of its proper divisors (10271823).

133533517 is a wasteful number, since it uses less digits than its factorization.

133533517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271822.

The product of its digits is 14175, while the sum is 31.

The square root of 133533517 is about 11555.6703397077. The cubic root of 133533517 is about 511.1284981360.

Adding to 133533517 its reverse (715335331), we get a palindrome (848868848).

The spelling of 133533517 in words is "one hundred thirty-three million, five hundred thirty-three thousand, five hundred seventeen".