133221691 has 2 divisors, whose sum is σ = 133221692. Its totient is φ = 133221690.

The previous prime is 133221637. The next prime is 133221709. The reversal of 133221691 is 196122331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133221691 - 2¹³ = 133213499 is a prime.

It is not a weakly prime, because it can be changed into another prime (133221091) 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, 66610845 + 66610846.

It is an arithmetic number, because the mean of its divisors is an integer number (66610846).

Almost surely, 2^133221691 is an apocalyptic number.

133221691 is a deficient number, since it is larger than the sum of its proper divisors (1).

133221691 is an equidigital number, since it uses as much as digits as its factorization.

133221691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 133221691 is about 11542.1701165769. The cubic root of 133221691 is about 510.7303274917.

The spelling of 133221691 in words is "one hundred thirty-three million, two hundred twenty-one thousand, six hundred ninety-one".