133331111 has 4 divisors (see below), whose sum is σ = 133963224. Its totient is φ = 132699000.

The previous prime is 133331083. The next prime is 133331129. The reversal of 133331111 is 111133331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111133331 = 9137 ⋅12163.

It is a cyclic number.

It is not a de Polignac number, because 133331111 - 2¹⁸ = 133068967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133331111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133331711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315740 + ... + 316161.

It is an arithmetic number, because the mean of its divisors is an integer number (33490806).

Almost surely, 2^133331111 is an apocalyptic number.

133331111 is a deficient number, since it is larger than the sum of its proper divisors (632113).

133331111 is an equidigital number, since it uses as much as digits as its factorization.

133331111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632112.

The product of its digits is 81, while the sum is 17.

The square root of 133331111 is about 11546.9091535354. The cubic root of 133331111 is about 510.8701165883.

Adding to 133331111 its reverse (111133331), we get a palindrome (244464442).

It can be divided in two parts, 133331 and 111, that multiplied together give a palindrome (14799741).

The spelling of 133331111 in words is "one hundred thirty-three million, three hundred thirty-one thousand, one hundred eleven".