133231164 has 36 divisors (see below), whose sum is σ = 341706792. Its totient is φ = 40372640.

The previous prime is 133231139. The next prime is 133231169. The reversal of 133231164 is 461132331.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133231169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44427 + ... + 47330.

Almost surely, 2^133231164 is an apocalyptic number.

It is an amenable number.

133231164 is an abundant number, since it is smaller than the sum of its proper divisors (208475628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133231164 is a wasteful number, since it uses less digits than its factorization.

133231164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91786 (or 91773 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

The square root of 133231164 is about 11542.5804740535. The cubic root of 133231164 is about 510.7424327119.

Adding to 133231164 its reverse (461132331), we get a palindrome (594363495).

The spelling of 133231164 in words is "one hundred thirty-three million, two hundred thirty-one thousand, one hundred sixty-four".