133881491 has 2 divisors, whose sum is σ = 133881492. Its totient is φ = 133881490.

The previous prime is 133881431. The next prime is 133881493. The reversal of 133881491 is 194188331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133881491 - 2¹⁸ = 133619347 is a prime.

Together with 133881493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133881493) 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, 66940745 + 66940746.

It is an arithmetic number, because the mean of its divisors is an integer number (66940746).

Almost surely, 2^133881491 is an apocalyptic number.

133881491 is a deficient number, since it is larger than the sum of its proper divisors (1).

133881491 is an equidigital number, since it uses as much as digits as its factorization.

133881491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 133881491 is about 11570.7169613641. The cubic root of 133881491 is about 511.5720950224.

The spelling of 133881491 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, four hundred ninety-one".