230717521 has 2 divisors, whose sum is σ = 230717522. Its totient is φ = 230717520.

The previous prime is 230717503. The next prime is 230717563. The reversal of 230717521 is 125717032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115799121 + 114918400 = 10761^2 + 10720^2 .

It is a cyclic number.

It is not a de Polignac number, because 230717521 - 2¹⁷ = 230586449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 230717521.

It is not a weakly prime, because it can be changed into another prime (230717021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115358760 + 115358761.

It is an arithmetic number, because the mean of its divisors is an integer number (115358761).

Almost surely, 2^230717521 is an apocalyptic number.

It is an amenable number.

230717521 is a deficient number, since it is larger than the sum of its proper divisors (1).

230717521 is an equidigital number, since it uses as much as digits as its factorization.

230717521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 230717521 is about 15189.3884340351. The cubic root of 230717521 is about 613.3290362477.

The spelling of 230717521 in words is "two hundred thirty million, seven hundred seventeen thousand, five hundred twenty-one".