530989721 has 2 divisors, whose sum is σ = 530989722. Its totient is φ = 530989720.

The previous prime is 530989709. The next prime is 530989727. The reversal of 530989721 is 127989035.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509134096 + 21855625 = 22564^2 + 4675^2 .

It is a cyclic number.

It is not a de Polignac number, because 530989721 - 2¹⁴ = 530973337 is a prime.

It is not a weakly prime, because it can be changed into another prime (530989727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265494860 + 265494861.

It is an arithmetic number, because the mean of its divisors is an integer number (265494861).

Almost surely, 2^530989721 is an apocalyptic number.

It is an amenable number.

530989721 is a deficient number, since it is larger than the sum of its proper divisors (1).

530989721 is an equidigital number, since it uses as much as digits as its factorization.

530989721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 530989721 is about 23043.2142072238. The cubic root of 530989721 is about 809.7706615879.

The spelling of 530989721 in words is "five hundred thirty million, nine hundred eighty-nine thousand, seven hundred twenty-one".