133873553 has 12 divisors (see below), whose sum is σ = 149232384. Its totient is φ = 119981400.

The previous prime is 133873549. The next prime is 133873559. The reversal of 133873553 is 355378331.

It is not a de Polignac number, because 133873553 - 2² = 133873549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133873559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800 + ... + 16382.

It is an arithmetic number, because the mean of its divisors is an integer number (12436032).

Almost surely, 2^133873553 is an apocalyptic number.

It is an amenable number.

133873553 is a deficient number, since it is larger than the sum of its proper divisors (15358831).

133873553 is a wasteful number, since it uses less digits than its factorization.

133873553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15676 (or 15665 counting only the distinct ones).

The product of its digits is 113400, while the sum is 38.

The square root of 133873553 is about 11570.3739351846. The cubic root of 133873553 is about 511.5619842408.

The spelling of 133873553 in words is "one hundred thirty-three million, eight hundred seventy-three thousand, five hundred fifty-three".