133345 has 4 divisors (see below), whose sum is σ = 160020. Its totient is φ = 106672.

The previous prime is 133337. The next prime is 133349. The reversal of 133345 is 543331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543331 = 59 ⋅9209.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 33489 = 316^2 + 183^2 .

It is a cyclic number.

It is not a de Polignac number, because 133345 - 2³ = 133337 is a prime.

It is an Ulam number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (133349) 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, 13330 + ... + 13339.

It is an arithmetic number, because the mean of its divisors is an integer number (40005).

2¹³³³⁴⁵ is an apocalyptic number.

It is an amenable number.

133345 is a deficient number, since it is larger than the sum of its proper divisors (26675).

133345 is an equidigital number, since it uses as much as digits as its factorization.

133345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26674.

The product of its digits is 540, while the sum is 19.

The square root of 133345 is about 365.1643465619. The cubic root of 133345 is about 51.0887854956.

Adding to 133345 its reverse (543331), we get a palindrome (676676).

It can be divided in two parts, 1333 and 45, that added together give a triangular number (1378 = T₅₂).

The spelling of 133345 in words is "one hundred thirty-three thousand, three hundred forty-five".