133313231 has 2 divisors, whose sum is σ = 133313232. Its totient is φ = 133313230.

The previous prime is 133313161. The next prime is 133313239. The reversal of 133313231 is 132313331.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133313231 is a prime.

It is a super-2 number, since 2×133313231² = 35544835119318722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133313239) 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, 66656615 + 66656616.

It is an arithmetic number, because the mean of its divisors is an integer number (66656616).

Almost surely, 2^133313231 is an apocalyptic number.

133313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

133313231 is an equidigital number, since it uses as much as digits as its factorization.

133313231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 20.

The square root of 133313231 is about 11546.1348944138. The cubic root of 133313231 is about 510.8472792926.

Adding to 133313231 its reverse (132313331), we get a palindrome (265626562).

The spelling of 133313231 in words is "one hundred thirty-three million, three hundred thirteen thousand, two hundred thirty-one".