133915 has 4 divisors (see below), whose sum is σ = 160704. Its totient is φ = 107128.

The previous prime is 133877. The next prime is 133919. The reversal of 133915 is 519331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 519331 = 83 ⋅6257.

It is a cyclic number.

It is not a de Polignac number, because 133915 - 2⁹ = 133403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13387 + ... + 13396.

It is an arithmetic number, because the mean of its divisors is an integer number (40176).

2¹³³⁹¹⁵ is an apocalyptic number.

133915 is a deficient number, since it is larger than the sum of its proper divisors (26789).

133915 is an equidigital number, since it uses as much as digits as its factorization.

133915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26788.

The product of its digits is 405, while the sum is 22.

The square root of 133915 is about 365.9439847846. The cubic root of 133915 is about 51.1614771669.

The spelling of 133915 in words is "one hundred thirty-three thousand, nine hundred fifteen".