133215550 has 24 divisors (see below), whose sum is σ = 266842296. Its totient is φ = 49187040.

The previous prime is 133215547. The next prime is 133215557. The reversal of 133215550 is 55512331.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133215557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101824 + ... + 103123.

It is an arithmetic number, because the mean of its divisors is an integer number (11118429).

Almost surely, 2^133215550 is an apocalyptic number.

133215550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133215550 is an abundant number, since it is smaller than the sum of its proper divisors (133626746).

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

133215550 is a wasteful number, since it uses less digits than its factorization.

133215550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204972 (or 204967 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 133215550 is about 11541.9040890141. The cubic root of 133215550 is about 510.7224798128.

Adding to 133215550 its reverse (55512331), we get a palindrome (188727881).

The spelling of 133215550 in words is "one hundred thirty-three million, two hundred fifteen thousand, five hundred fifty".