133237231 has 2 divisors, whose sum is σ = 133237232. Its totient is φ = 133237230.

The previous prime is 133237219. The next prime is 133237271. The reversal of 133237231 is 132732331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133237231 - 2²⁵ = 99682799 is a prime.

It is a super-2 number, since 2×133237231² = 35504319449094722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133237196 and 133237205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133237271) 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 as a sum of consecutive naturals, namely, 66618615 + 66618616.

It is an arithmetic number, because the mean of its divisors is an integer number (66618616).

Almost surely, 2^133237231 is an apocalyptic number.

133237231 is a deficient number, since it is larger than the sum of its proper divisors (1).

133237231 is an equidigital number, since it uses as much as digits as its factorization.

133237231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 25.

The square root of 133237231 is about 11542.8432805787. The cubic root of 133237231 is about 510.7501852207.

Adding to 133237231 its reverse (132732331), we get a palindrome (265969562).

The spelling of 133237231 in words is "one hundred thirty-three million, two hundred thirty-seven thousand, two hundred thirty-one".