133688197 has 2 divisors, whose sum is σ = 133688198. Its totient is φ = 133688196.

The previous prime is 133688189. The next prime is 133688227. The reversal of 133688197 is 791886331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119049921 + 14638276 = 10911^2 + 3826^2 .

It is an emirp because it is prime and its reverse (791886331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133688197 - 2³ = 133688189 is a prime.

It is a super-2 number, since 2×133688197² = 35745068034221618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133688117) 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, 66844098 + 66844099.

It is an arithmetic number, because the mean of its divisors is an integer number (66844099).

Almost surely, 2^133688197 is an apocalyptic number.

It is an amenable number.

133688197 is a deficient number, since it is larger than the sum of its proper divisors (1).

133688197 is an equidigital number, since it uses as much as digits as its factorization.

133688197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 133688197 is about 11562.3612207888. The cubic root of 133688197 is about 511.3257790642.

The spelling of 133688197 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, one hundred ninety-seven".