231032513 has 2 divisors, whose sum is σ = 231032514. Its totient is φ = 231032512.

The previous prime is 231032497. The next prime is 231032521. The reversal of 231032513 is 315230132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211033729 + 19998784 = 14527^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 231032513 - 2⁴ = 231032497 is a prime.

It is not a weakly prime, because it can be changed into another prime (231032413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115516256 + 115516257.

It is an arithmetic number, because the mean of its divisors is an integer number (115516257).

Almost surely, 2^231032513 is an apocalyptic number.

It is an amenable number.

231032513 is a deficient number, since it is larger than the sum of its proper divisors (1).

231032513 is an equidigital number, since it uses as much as digits as its factorization.

231032513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 231032513 is about 15199.7537151100. The cubic root of 231032513 is about 613.6080294872.

Adding to 231032513 its reverse (315230132), we get a palindrome (546262645).

The spelling of 231032513 in words is "two hundred thirty-one million, thirty-two thousand, five hundred thirteen".