133155111 has 4 divisors (see below), whose sum is σ = 177540152. Its totient is φ = 88770072.

The previous prime is 133155109. The next prime is 133155149. The reversal of 133155111 is 111551331.

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

It is not a de Polignac number, because 133155111 - 2¹ = 133155109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133155181) 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, 22192516 + ... + 22192521.

It is an arithmetic number, because the mean of its divisors is an integer number (44385038).

Almost surely, 2^133155111 is an apocalyptic number.

133155111 is a deficient number, since it is larger than the sum of its proper divisors (44385041).

133155111 is an equidigital number, since it uses as much as digits as its factorization.

133155111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44385040.

The product of its digits is 225, while the sum is 21.

The square root of 133155111 is about 11539.2855498077. The cubic root of 133155111 is about 510.6452310100.

The spelling of 133155111 in words is "one hundred thirty-three million, one hundred fifty-five thousand, one hundred eleven".