133518989 has 2 divisors, whose sum is σ = 133518990. Its totient is φ = 133518988.

The previous prime is 133518961. The next prime is 133518997. The reversal of 133518989 is 989815331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90878089 + 42640900 = 9533^2 + 6530^2 .

It is a cyclic number.

It is not a de Polignac number, because 133518989 - 2⁸ = 133518733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133518589) 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, 66759494 + 66759495.

It is an arithmetic number, because the mean of its divisors is an integer number (66759495).

Almost surely, 2^133518989 is an apocalyptic number.

It is an amenable number.

133518989 is a deficient number, since it is larger than the sum of its proper divisors (1).

133518989 is an equidigital number, since it uses as much as digits as its factorization.

133518989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 133518989 is about 11555.0417134686. The cubic root of 133518989 is about 511.1099611068.

The spelling of 133518989 in words is "one hundred thirty-three million, five hundred eighteen thousand, nine hundred eighty-nine".