133133431 has 2 divisors, whose sum is σ = 133133432. Its totient is φ = 133133430.

The previous prime is 133133423. The next prime is 133133447. The reversal of 133133431 is 134331331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133133431 - 2³ = 133133423 is a prime.

It is a super-4 number, since 4×133133431⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133133731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66566715 + 66566716.

It is an arithmetic number, because the mean of its divisors is an integer number (66566716).

Almost surely, 2^133133431 is an apocalyptic number.

133133431 is a deficient number, since it is larger than the sum of its proper divisors (1).

133133431 is an equidigital number, since it uses as much as digits as its factorization.

133133431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 22.

The square root of 133133431 is about 11538.3461119868. The cubic root of 133133431 is about 510.6175154898.

Adding to 133133431 its reverse (134331331), we get a palindrome (267464762).

The spelling of 133133431 in words is "one hundred thirty-three million, one hundred thirty-three thousand, four hundred thirty-one".