133897187 has 2 divisors, whose sum is σ = 133897188. Its totient is φ = 133897186.

The previous prime is 133897097. The next prime is 133897229. The reversal of 133897187 is 781798331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133897187 - 2¹² = 133893091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133891187) 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, 66948593 + 66948594.

It is an arithmetic number, because the mean of its divisors is an integer number (66948594).

Almost surely, 2^133897187 is an apocalyptic number.

133897187 is a deficient number, since it is larger than the sum of its proper divisors (1).

133897187 is an equidigital number, since it uses as much as digits as its factorization.

133897187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 133897187 is about 11571.3952054193. The cubic root of 133897187 is about 511.5920861398.

The spelling of 133897187 in words is "one hundred thirty-three million, eight hundred ninety-seven thousand, one hundred eighty-seven".