133455 has 32 divisors (see below), whose sum is σ = 258048. Its totient is φ = 57600.

The previous prime is 133451. The next prime is 133481. The reversal of 133455 is 554331.

133455 = T₃₁ + T₃₂ + ... + T₉₃.

133455 = 50² + 51² + ... + 80².

It is not a de Polignac number, because 133455 - 2² = 133451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3235 + ... + 3275.

It is an arithmetic number, because the mean of its divisors is an integer number (8064).

2¹³³⁴⁵⁵ is an apocalyptic number.

133455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133455 is a deficient number, since it is larger than the sum of its proper divisors (124593).

133455 is a wasteful number, since it uses less digits than its factorization.

133455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87.

The product of its digits is 900, while the sum is 21.

The square root of 133455 is about 365.3149326266. The cubic root of 133455 is about 51.1028298212.

Adding to 133455 its reverse (554331), we get a palindrome (687786).

The spelling of 133455 in words is "one hundred thirty-three thousand, four hundred fifty-five".