133545231 has 6 divisors (see below), whose sum is σ = 192898680. Its totient is φ = 89030148.

The previous prime is 133545211. The next prime is 133545233. The reversal of 133545231 is 132545331.

133545231 is a `hidden beast` number, since 133 + 5 + 4 + 523 + 1 = 666.

It is not a de Polignac number, because 133545231 - 2⁷ = 133545103 is a prime.

It is a super-2 number, since 2×133545231² = 35668657445686722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133545195 and 133545204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133545233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7419171 + ... + 7419188.

It is an arithmetic number, because the mean of its divisors is an integer number (32149780).

Almost surely, 2^133545231 is an apocalyptic number.

133545231 is a deficient number, since it is larger than the sum of its proper divisors (59353449).

133545231 is a wasteful number, since it uses less digits than its factorization.

133545231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14838365 (or 14838362 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 133545231 is about 11556.1771793271. The cubic root of 133545231 is about 511.1434436576.

The spelling of 133545231 in words is "one hundred thirty-three million, five hundred forty-five thousand, two hundred thirty-one".