133811550 has 36 divisors (see below), whose sum is σ = 359508240. Its totient is φ = 35682960.

The previous prime is 133811537. The next prime is 133811551. The reversal of 133811550 is 55118331.

133811550 is a `hidden beast` number, since 1 + 33 + 81 + 1 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133811551) 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 17 ways as a sum of consecutive naturals, for example, 148230 + ... + 149129.

It is an arithmetic number, because the mean of its divisors is an integer number (9986340).

Almost surely, 2^133811550 is an apocalyptic number.

133811550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133811550 is an abundant number, since it is smaller than the sum of its proper divisors (225696690).

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

133811550 is a wasteful number, since it uses less digits than its factorization.

133811550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297377 (or 297369 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 133811550 is about 11567.6942386977. The cubic root of 133811550 is about 511.4829960837.

Adding to 133811550 its reverse (55118331), we get a palindrome (188929881).

The spelling of 133811550 in words is "one hundred thirty-three million, eight hundred eleven thousand, five hundred fifty".