230620721 has 2 divisors, whose sum is σ = 230620722. Its totient is φ = 230620720.

The previous prime is 230620699. The next prime is 230620723. The reversal of 230620721 is 127026032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203205025 + 27415696 = 14255^2 + 5236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230620721 is a prime.

Together with 230620723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (230620723) 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, 115310360 + 115310361.

It is an arithmetic number, because the mean of its divisors is an integer number (115310361).

Almost surely, 2^230620721 is an apocalyptic number.

It is an amenable number.

230620721 is a deficient number, since it is larger than the sum of its proper divisors (1).

230620721 is an equidigital number, since it uses as much as digits as its factorization.

230620721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 230620721 is about 15186.2016646691. The cubic root of 230620721 is about 613.2432479996.

Adding to 230620721 its reverse (127026032), we get a palindrome (357646753).

The spelling of 230620721 in words is "two hundred thirty million, six hundred twenty thousand, seven hundred twenty-one".