133235881 has 2 divisors, whose sum is σ = 133235882. Its totient is φ = 133235880.

The previous prime is 133235863. The next prime is 133235897. The reversal of 133235881 is 188532331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69155856 + 64080025 = 8316^2 + 8005^2 .

It is a cyclic number.

It is not a de Polignac number, because 133235881 - 2⁹ = 133235369 is a prime.

It is a super-2 number, since 2×133235881² = 35503599971692322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133238881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66617940 + 66617941.

It is an arithmetic number, because the mean of its divisors is an integer number (66617941).

Almost surely, 2^133235881 is an apocalyptic number.

It is an amenable number.

133235881 is a deficient number, since it is larger than the sum of its proper divisors (1).

133235881 is an equidigital number, since it uses as much as digits as its factorization.

133235881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 133235881 is about 11542.7848026375. The cubic root of 133235881 is about 510.7484601896.

The spelling of 133235881 in words is "one hundred thirty-three million, two hundred thirty-five thousand, eight hundred eighty-one".