720569 has 2 divisors, whose sum is σ = 720570. Its totient is φ = 720568.

The previous prime is 720547. The next prime is 720571. The reversal of 720569 is 965027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570025 + 150544 = 755^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 720569 - 2¹⁶ = 655033 is a prime.

It is a super-2 number, since 2×720569² = 1038439367522, which contains 22 as substring.

Together with 720571, 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 (720869) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360284 + 360285.

It is an arithmetic number, because the mean of its divisors is an integer number (360285).

2⁷²⁰⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

720569 is a deficient number, since it is larger than the sum of its proper divisors (1).

720569 is an equidigital number, since it uses as much as digits as its factorization.

720569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 720569 is about 848.8633576731. The cubic root of 720569 is about 89.6516990782.

The spelling of 720569 in words is "seven hundred twenty thousand, five hundred sixty-nine".