133585409 has 4 divisors (see below), whose sum is σ = 140616240. Its totient is φ = 126554580.

The previous prime is 133585399. The next prime is 133585411. The reversal of 133585409 is 904585331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133585409 - 2¹⁶ = 133519873 is a prime.

It is a super-2 number, since 2×133585409² = 35690122995394562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133585469) 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, 3515387 + ... + 3515424.

It is an arithmetic number, because the mean of its divisors is an integer number (35154060).

Almost surely, 2^133585409 is an apocalyptic number.

133585409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

133585409 is a deficient number, since it is larger than the sum of its proper divisors (7030831).

133585409 is an equidigital number, since it uses as much as digits as its factorization.

133585409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7030830.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 133585409 is about 11557.9154262350. The cubic root of 133585409 is about 511.1946988563.

The spelling of 133585409 in words is "one hundred thirty-three million, five hundred eighty-five thousand, four hundred nine".