133771 has 4 divisors (see below), whose sum is σ = 145944. Its totient is φ = 121600.

The previous prime is 133769. The next prime is 133781. The reversal of 133771 is 177331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133771 - 2¹ = 133769 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (133711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6070 + ... + 6091.

It is an arithmetic number, because the mean of its divisors is an integer number (36486).

2¹³³⁷⁷¹ is an apocalyptic number.

133771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133771 is the 196-th centered heptagonal number.

133771 is a deficient number, since it is larger than the sum of its proper divisors (12173).

133771 is a wasteful number, since it uses less digits than its factorization.

133771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12172.

The product of its digits is 441, while the sum is 22.

The square root of 133771 is about 365.7471804403. The cubic root of 133771 is about 51.1431324583.

The spelling of 133771 in words is "one hundred thirty-three thousand, seven hundred seventy-one".