230143993 has 2 divisors, whose sum is σ = 230143994. Its totient is φ = 230143992.

The previous prime is 230143981. The next prime is 230144021. The reversal of 230143993 is 399341032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209323024 + 20820969 = 14468^2 + 4563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230143993 is a prime.

It is not a weakly prime, because it can be changed into another prime (230143393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115071996 + 115071997.

It is an arithmetic number, because the mean of its divisors is an integer number (115071997).

Almost surely, 2^230143993 is an apocalyptic number.

It is an amenable number.

230143993 is a deficient number, since it is larger than the sum of its proper divisors (1).

230143993 is an equidigital number, since it uses as much as digits as its factorization.

230143993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 230143993 is about 15170.4974539400. The cubic root of 230143993 is about 612.8204009088.

The spelling of 230143993 in words is "two hundred thirty million, one hundred forty-three thousand, nine hundred ninety-three".