133559231 has 4 divisors (see below), whose sum is σ = 143833032. Its totient is φ = 123285432.

The previous prime is 133559213. The next prime is 133559243. The reversal of 133559231 is 132955331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132955331 = 19 ⋅6997649.

It is a cyclic number.

It is not a de Polignac number, because 133559231 - 2²² = 129364927 is a prime.

It is a super-2 number, since 2×133559231² = 35676136370622722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133559431) 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, 5136881 + ... + 5136906.

It is an arithmetic number, because the mean of its divisors is an integer number (35958258).

Almost surely, 2^133559231 is an apocalyptic number.

133559231 is a deficient number, since it is larger than the sum of its proper divisors (10273801).

133559231 is a wasteful number, since it uses less digits than its factorization.

133559231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10273800.

The product of its digits is 12150, while the sum is 32.

The square root of 133559231 is about 11556.7829000981. The cubic root of 133559231 is about 511.1613046677.

The spelling of 133559231 in words is "one hundred thirty-three million, five hundred fifty-nine thousand, two hundred thirty-one".