133544550 has 48 divisors (see below), whose sum is σ = 332603712. Its totient is φ = 35460000.

The previous prime is 133544533. The next prime is 133544557. The reversal of 133544550 is 55445331.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133544557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35877 + ... + 39423.

It is an arithmetic number, because the mean of its divisors is an integer number (6929244).

Almost surely, 2^133544550 is an apocalyptic number.

133544550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 133544550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166301856).

133544550 is an abundant number, since it is smaller than the sum of its proper divisors (199059162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133544550 is a wasteful number, since it uses less digits than its factorization.

133544550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3813 (or 3808 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 133544550 is about 11556.1477145284. The cubic root of 133544550 is about 511.1425748152.

Adding to 133544550 its reverse (55445331), we get a palindrome (188989881).

The spelling of 133544550 in words is "one hundred thirty-three million, five hundred forty-four thousand, five hundred fifty".