133807979 has 4 divisors (see below), whose sum is σ = 133856976. Its totient is φ = 133758984.

The previous prime is 133807963. The next prime is 133807991. The reversal of 133807979 is 979708331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133807979 - 2⁴ = 133807963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133807279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20144 + ... + 25949.

It is an arithmetic number, because the mean of its divisors is an integer number (33464244).

Almost surely, 2^133807979 is an apocalyptic number.

133807979 is a deficient number, since it is larger than the sum of its proper divisors (48997).

133807979 is an equidigital number, since it uses as much as digits as its factorization.

133807979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48996.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 133807979 is about 11567.5398853862. The cubic root of 133807979 is about 511.4784460977.

The spelling of 133807979 in words is "one hundred thirty-three million, eight hundred seven thousand, nine hundred seventy-nine".