133865989 has 2 divisors, whose sum is σ = 133865990. Its totient is φ = 133865988.

The previous prime is 133865987. The next prime is 133866079. The reversal of 133865989 is 989568331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133864900 + 1089 = 11570^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 133865989 - 2¹ = 133865987 is a prime.

Together with 133865987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133865981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66932994 + 66932995.

It is an arithmetic number, because the mean of its divisors is an integer number (66932995).

Almost surely, 2^133865989 is an apocalyptic number.

It is an amenable number.

133865989 is a deficient number, since it is larger than the sum of its proper divisors (1).

133865989 is an equidigital number, since it uses as much as digits as its factorization.

133865989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The square root of 133865989 is about 11570.0470612699. The cubic root of 133865989 is about 511.5523494582.

The spelling of 133865989 in words is "one hundred thirty-three million, eight hundred sixty-five thousand, nine hundred eighty-nine".