231011133 has 4 divisors (see below), whose sum is σ = 308014848. Its totient is φ = 154007420.

The previous prime is 231011119. The next prime is 231011173. The reversal of 231011133 is 331110132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231011133 - 2⁶ = 231011069 is a prime.

It is a super-2 number, since 2×231011133² = 106732287139887378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231011173) 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, 38501853 + ... + 38501858.

It is an arithmetic number, because the mean of its divisors is an integer number (77003712).

Almost surely, 2^231011133 is an apocalyptic number.

It is an amenable number.

231011133 is a deficient number, since it is larger than the sum of its proper divisors (77003715).

231011133 is an equidigital number, since it uses as much as digits as its factorization.

231011133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77003714.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 231011133 is about 15199.0503979689. The cubic root of 231011133 is about 613.5891009186.

Adding to 231011133 its reverse (331110132), we get a palindrome (562121265).

The spelling of 231011133 in words is "two hundred thirty-one million, eleven thousand, one hundred thirty-three".