133215 has 16 divisors (see below), whose sum is σ = 217728. Its totient is φ = 69536.

The previous prime is 133213. The next prime is 133241. The reversal of 133215 is 512331.

It is a happy number.

133215 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 133215 - 2¹ = 133213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

133215 is strictly pandigital in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 133194 and 133203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1192 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (13608).

2¹³³²¹⁵ is an apocalyptic number.

133215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133215 is a deficient number, since it is larger than the sum of its proper divisors (84513).

133215 is a wasteful number, since it uses less digits than its factorization.

133215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198.

The product of its digits is 90, while the sum is 15.

The square root of 133215 is about 364.9863011128. The cubic root of 133215 is about 51.0721776948.

Adding to 133215 its reverse (512331), we get a palindrome (645546).

The spelling of 133215 in words is "one hundred thirty-three thousand, two hundred fifteen".