133819799 has 4 divisors (see below), whose sum is σ = 133900536. Its totient is φ = 133739064.

The previous prime is 133819783. The next prime is 133819811. The reversal of 133819799 is 997918331.

It is a happy number.

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 133819799 - 2⁴ = 133819783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133819709) 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, 37829 + ... + 41214.

It is an arithmetic number, because the mean of its divisors is an integer number (33475134).

Almost surely, 2^133819799 is an apocalyptic number.

133819799 is a deficient number, since it is larger than the sum of its proper divisors (80737).

133819799 is an equidigital number, since it uses as much as digits as its factorization.

133819799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80736.

The product of its digits is 367416, while the sum is 50.

The square root of 133819799 is about 11568.0507865414. The cubic root of 133819799 is about 511.4935062291.

The spelling of 133819799 in words is "one hundred thirty-three million, eight hundred nineteen thousand, seven hundred ninety-nine".