230643661 has 2 divisors, whose sum is σ = 230643662. Its totient is φ = 230643660.

The previous prime is 230643659. The next prime is 230643683. The reversal of 230643661 is 166346032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184144900 + 46498761 = 13570^2 + 6819^2 .

It is a cyclic number.

It is not a de Polignac number, because 230643661 - 2¹ = 230643659 is a prime.

Together with 230643659, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230643631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115321830 + 115321831.

It is an arithmetic number, because the mean of its divisors is an integer number (115321831).

Almost surely, 2^230643661 is an apocalyptic number.

It is an amenable number.

230643661 is a deficient number, since it is larger than the sum of its proper divisors (1).

230643661 is an equidigital number, since it uses as much as digits as its factorization.

230643661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 230643661 is about 15186.9569367928. The cubic root of 230643661 is about 613.2635805665.

Adding to 230643661 its reverse (166346032), we get a palindrome (396989693).

The spelling of 230643661 in words is "two hundred thirty million, six hundred forty-three thousand, six hundred sixty-one".