133881929 has 2 divisors, whose sum is σ = 133881930. Its totient is φ = 133881928.

The previous prime is 133881911. The next prime is 133881971. The reversal of 133881929 is 929188331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133356304 + 525625 = 11548^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 133881929 - 2⁸ = 133881673 is a prime.

It is a super-2 number, since 2×133881929² = 35848741825522082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133881929.

It is not a weakly prime, because it can be changed into another prime (133881989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66940964 + 66940965.

It is an arithmetic number, because the mean of its divisors is an integer number (66940965).

Almost surely, 2^133881929 is an apocalyptic number.

It is an amenable number.

133881929 is a deficient number, since it is larger than the sum of its proper divisors (1).

133881929 is an equidigital number, since it uses as much as digits as its factorization.

133881929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 133881929 is about 11570.7358884386. The cubic root of 133881929 is about 511.5726528997.

The spelling of 133881929 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, nine hundred twenty-nine".