230311931 has 2 divisors, whose sum is σ = 230311932. Its totient is φ = 230311930.

The previous prime is 230311919. The next prime is 230312003. The reversal of 230311931 is 139113032.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 230311931 - 2⁶ = 230311867 is a prime.

It is a super-2 number, since 2×230311931² = 106087171121897522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 230311897 and 230311906.

It is not a weakly prime, because it can be changed into another prime (230311031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115155965 + 115155966.

It is an arithmetic number, because the mean of its divisors is an integer number (115155966).

Almost surely, 2^230311931 is an apocalyptic number.

230311931 is a deficient number, since it is larger than the sum of its proper divisors (1).

230311931 is an equidigital number, since it uses as much as digits as its factorization.

230311931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 230311931 is about 15176.0314641213. The cubic root of 230311931 is about 612.9694247271.

Adding to 230311931 its reverse (139113032), we get a palindrome (369424963).

The spelling of 230311931 in words is "two hundred thirty million, three hundred eleven thousand, nine hundred thirty-one".