133881971 has 2 divisors, whose sum is σ = 133881972. Its totient is φ = 133881970.

The previous prime is 133881929. The next prime is 133881983. The reversal of 133881971 is 179188331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133881971 - 2²⁶ = 66773107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133881911) 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, 66940985 + 66940986.

It is an arithmetic number, because the mean of its divisors is an integer number (66940986).

Almost surely, 2^133881971 is an apocalyptic number.

133881971 is a deficient number, since it is larger than the sum of its proper divisors (1).

133881971 is an equidigital number, since it uses as much as digits as its factorization.

133881971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 133881971 is about 11570.7377033619. The cubic root of 133881971 is about 511.5727063947.

The spelling of 133881971 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, nine hundred seventy-one".