231930011 has 2 divisors, whose sum is σ = 231930012. Its totient is φ = 231930010.

The previous prime is 231930001. The next prime is 231930019. The reversal of 231930011 is 110039132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231930011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231930019) 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, 115965005 + 115965006.

It is an arithmetic number, because the mean of its divisors is an integer number (115965006).

Almost surely, 2^231930011 is an apocalyptic number.

231930011 is a deficient number, since it is larger than the sum of its proper divisors (1).

231930011 is an equidigital number, since it uses as much as digits as its factorization.

231930011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 231930011 is about 15229.2485369436. The cubic root of 231930011 is about 614.4015691576.

Adding to 231930011 its reverse (110039132), we get a palindrome (341969143).

The spelling of 231930011 in words is "two hundred thirty-one million, nine hundred thirty thousand, eleven".