133771331 has 4 divisors (see below), whose sum is σ = 134007000. Its totient is φ = 133535664.

The previous prime is 133771273. The next prime is 133771357. The reversal of 133771331 is 133177331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133771331 is a prime.

It is a super-2 number, since 2×133771331² = 35789537995023122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133771294 and 133771303.

It is not an unprimeable number, because it can be changed into a prime (133771031) 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, 116981 + ... + 118118.

It is an arithmetic number, because the mean of its divisors is an integer number (33501750).

Almost surely, 2^133771331 is an apocalyptic number.

133771331 is a deficient number, since it is larger than the sum of its proper divisors (235669).

133771331 is an equidigital number, since it uses as much as digits as its factorization.

133771331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235668.

The product of its digits is 3969, while the sum is 29.

The square root of 133771331 is about 11565.9556890038. The cubic root of 133771331 is about 511.4317464071.

The spelling of 133771331 in words is "one hundred thirty-three million, seven hundred seventy-one thousand, three hundred thirty-one".