133645449 has 72 divisors (see below), whose sum is σ = 232062528. Its totient is φ = 66977280.

The previous prime is 133645423. The next prime is 133645453. The reversal of 133645449 is 944546331.

It is not a de Polignac number, because 133645449 - 2¹¹ = 133643401 is a prime.

It is a super-2 number, since 2×133645449² = 35722212076823202, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133645409) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2190879 + ... + 2190939.

Almost surely, 2^133645449 is an apocalyptic number.

133645449 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

133645449 is a deficient number, since it is larger than the sum of its proper divisors (98417079).

133645449 is a wasteful number, since it uses less digits than its factorization.

133645449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 107 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 133645449 is about 11560.5124886399. The cubic root of 133645449 is about 511.2712729196.

The spelling of 133645449 in words is "one hundred thirty-three million, six hundred forty-five thousand, four hundred forty-nine".