133491311 has 2 divisors, whose sum is σ = 133491312. Its totient is φ = 133491310.

The previous prime is 133491251. The next prime is 133491313. The reversal of 133491311 is 113194331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133491311 - 2¹⁴ = 133474927 is a prime.

It is a super-2 number, since 2×133491311² = 35639860224997442, which contains 22 as substring.

Together with 133491313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133491313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66745655 + 66745656.

It is an arithmetic number, because the mean of its divisors is an integer number (66745656).

Almost surely, 2^133491311 is an apocalyptic number.

133491311 is a deficient number, since it is larger than the sum of its proper divisors (1).

133491311 is an equidigital number, since it uses as much as digits as its factorization.

133491311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 133491311 is about 11553.8439923689. The cubic root of 133491311 is about 511.0746415885.

The spelling of 133491311 in words is "one hundred thirty-three million, four hundred ninety-one thousand, three hundred eleven".