133499865 has 16 divisors (see below), whose sum is σ = 214007616. Its totient is φ = 71064000.

The previous prime is 133499851. The next prime is 133499869. The reversal of 133499865 is 568994331.

It is not a de Polignac number, because 133499865 - 2⁶ = 133499801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133499869) 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 in 15 ways as a sum of consecutive naturals, for example, 111 + ... + 16340.

It is an arithmetic number, because the mean of its divisors is an integer number (13375476).

Almost surely, 2^133499865 is an apocalyptic number.

133499865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133499865 is a deficient number, since it is larger than the sum of its proper divisors (80507751).

133499865 is a wasteful number, since it uses less digits than its factorization.

133499865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17000.

The product of its digits is 699840, while the sum is 48.

The square root of 133499865 is about 11554.2141662685. The cubic root of 133499865 is about 511.0855577524.

The spelling of 133499865 in words is "one hundred thirty-three million, four hundred ninety-nine thousand, eight hundred sixty-five".