231320029 has 2 divisors, whose sum is σ = 231320030. Its totient is φ = 231320028.

The previous prime is 231320027. The next prime is 231320069. The reversal of 231320029 is 920023132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199656900 + 31663129 = 14130^2 + 5627^2 .

It is a cyclic number.

It is not a de Polignac number, because 231320029 - 2¹ = 231320027 is a prime.

Together with 231320027, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231319991 and 231320009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231320021) 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 as a sum of consecutive naturals, namely, 115660014 + 115660015.

It is an arithmetic number, because the mean of its divisors is an integer number (115660015).

Almost surely, 2^231320029 is an apocalyptic number.

It is an amenable number.

231320029 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320029 is an equidigital number, since it uses as much as digits as its factorization.

231320029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 231320029 is about 15209.2086907899. The cubic root of 231320029 is about 613.8624655256.

The spelling of 231320029 in words is "two hundred thirty-one million, three hundred twenty thousand, twenty-nine".