133220409 has 16 divisors (see below), whose sum is σ = 204223488. Its totient is φ = 75668112.

The previous prime is 133220383. The next prime is 133220413. The reversal of 133220409 is 904022331.

It is not a de Polignac number, because 133220409 - 2⁵ = 133220377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133220459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15487 + ... + 22500.

It is an arithmetic number, because the mean of its divisors is an integer number (12763968).

Almost surely, 2^133220409 is an apocalyptic number.

It is an amenable number.

133220409 is a deficient number, since it is larger than the sum of its proper divisors (71003079).

133220409 is a wasteful number, since it uses less digits than its factorization.

133220409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38164.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 133220409 is about 11542.1145809596. The cubic root of 133220409 is about 510.7286892240.

The spelling of 133220409 in words is "one hundred thirty-three million, two hundred twenty thousand, four hundred nine".