133640605 has 16 divisors (see below), whose sum is σ = 186387840. Its totient is φ = 90084672.

The previous prime is 133640537. The next prime is 133640609. The reversal of 133640605 is 506046331.

It is a cyclic number.

It is not a de Polignac number, because 133640605 - 2⁹ = 133640093 is a prime.

It is a super-3 number, since 3×133640605³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133640609) 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, 30294 + ... + 34423.

It is an arithmetic number, because the mean of its divisors is an integer number (11649240).

Almost surely, 2^133640605 is an apocalyptic number.

It is an amenable number.

133640605 is a deficient number, since it is larger than the sum of its proper divisors (52747235).

133640605 is an equidigital number, since it uses as much as digits as its factorization.

133640605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64788.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 133640605 is about 11560.3029804586. The cubic root of 133640605 is about 511.2650958095.

Adding to 133640605 its reverse (506046331), we get a palindrome (639686936).

The spelling of 133640605 in words is "one hundred thirty-three million, six hundred forty thousand, six hundred five".