231520027 has 2 divisors, whose sum is σ = 231520028. Its totient is φ = 231520026.

The previous prime is 231519973. The next prime is 231520031. The reversal of 231520027 is 720025132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231520027 is a prime.

It is not a weakly prime, because it can be changed into another prime (231520057) 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, 115760013 + 115760014.

It is an arithmetic number, because the mean of its divisors is an integer number (115760014).

Almost surely, 2^231520027 is an apocalyptic number.

231520027 is a deficient number, since it is larger than the sum of its proper divisors (1).

231520027 is an equidigital number, since it uses as much as digits as its factorization.

231520027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 231520027 is about 15215.7821685249. The cubic root of 231520027 is about 614.0393285789.

Adding to 231520027 its reverse (720025132), we get a palindrome (951545159).

The spelling of 231520027 in words is "two hundred thirty-one million, five hundred twenty thousand, twenty-seven".