231320033 has 6 divisors (see below), whose sum is σ = 269086626. Its totient is φ = 198274272.

The previous prime is 231320029. The next prime is 231320069. The reversal of 231320033 is 330023132.

It can be written as a sum of positive squares in only one way, i.e., 228402769 + 2917264 = 15113^2 + 1708^2 .

It is not a de Polignac number, because 231320033 - 2² = 231320029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231319993 and 231320020.

It is not an unprimeable number, because it can be changed into a prime (231320333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2360360 + ... + 2360457.

It is an arithmetic number, because the mean of its divisors is an integer number (44847771).

Almost surely, 2^231320033 is an apocalyptic number.

It is an amenable number.

231320033 is a deficient number, since it is larger than the sum of its proper divisors (37766593).

231320033 is an equidigital number, since it uses as much as digits as its factorization.

231320033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720831 (or 4720824 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 231320033 is about 15209.2088222892. The cubic root of 231320033 is about 613.8624690639.

Adding to 231320033 its reverse (330023132), we get a palindrome (561343165).

The spelling of 231320033 in words is "two hundred thirty-one million, three hundred twenty thousand, thirty-three".