133333231 has 8 divisors (see below), whose sum is σ = 140510304. Its totient is φ = 126271200.

The previous prime is 133333229. The next prime is 133333253. The reversal of 133333231 is 132333331.

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 133333231 - 2¹ = 133333229 is a prime.

It is a super-2 number, since 2×133333231² = 35555500977798722, 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 (133313231) 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, 26376 + ... + 31021.

It is an arithmetic number, because the mean of its divisors is an integer number (17563788).

Almost surely, 2^133333231 is an apocalyptic number.

133333231 is a deficient number, since it is larger than the sum of its proper divisors (7177073).

133333231 is a wasteful number, since it uses less digits than its factorization.

133333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57521.

The product of its digits is 1458, while the sum is 22.

The square root of 133333231 is about 11547.0009526283. Note that the first 3 decimals coincide. The cubic root of 133333231 is about 510.8728242307.

Subtracting from 133333231 its sum of digits (22), we obtain a square (133333209 = 11547²).

Adding to 133333231 its reverse (132333331), we get a palindrome (265666562).

The spelling of 133333231 in words is "one hundred thirty-three million, three hundred thirty-three thousand, two hundred thirty-one".