133404231 has 4 divisors (see below), whose sum is σ = 177872312. Its totient is φ = 88936152.

The previous prime is 133404221. The next prime is 133404247. The reversal of 133404231 is 132404331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 133404231 - 2¹¹ = 133402183 is a prime.

It is a super-2 number, since 2×133404231² = 35593377697402722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133404198 and 133404207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133404221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22234036 + ... + 22234041.

It is an arithmetic number, because the mean of its divisors is an integer number (44468078).

Almost surely, 2^133404231 is an apocalyptic number.

133404231 is a deficient number, since it is larger than the sum of its proper divisors (44468081).

133404231 is an equidigital number, since it uses as much as digits as its factorization.

133404231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44468080.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 133404231 is about 11550.0749348219. The cubic root of 133404231 is about 510.9634881356.

Adding to 133404231 its reverse (132404331), we get a palindrome (265808562).

It can be divided in two parts, 13340 and 4231, that added together give a palindrome (17571).

The spelling of 133404231 in words is "one hundred thirty-three million, four hundred four thousand, two hundred thirty-one".