133868539 has 12 divisors (see below), whose sum is σ = 155976624. Its totient is φ = 114558864.

The previous prime is 133868521. The next prime is 133868561. The reversal of 133868539 is 935868331.

It is not a de Polignac number, because 133868539 - 2⁷ = 133868411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133868569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34569 + ... + 38245.

It is an arithmetic number, because the mean of its divisors is an integer number (12998052).

Almost surely, 2^133868539 is an apocalyptic number.

133868539 is a deficient number, since it is larger than the sum of its proper divisors (22108085).

133868539 is an equidigital number, since it uses as much as digits as its factorization.

133868539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434 (or 4427 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 133868539 is about 11570.1572590868. The cubic root of 133868539 is about 511.5555976076. Note that the first 4 decimals are identical.

The spelling of 133868539 in words is "one hundred thirty-three million, eight hundred sixty-eight thousand, five hundred thirty-nine".