720997 has 2 divisors, whose sum is σ = 720998. Its totient is φ = 720996.

The previous prime is 720991. The next prime is 721003. The reversal of 720997 is 799027.

It is a balanced prime because it is at equal distance from previous prime (720991) and next prime (721003).

It can be written as a sum of positive squares in only one way, i.e., 720801 + 196 = 849^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 720997 - 2⁷ = 720869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360498 + 360499.

It is an arithmetic number, because the mean of its divisors is an integer number (360499).

2⁷²⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

720997 is a deficient number, since it is larger than the sum of its proper divisors (1).

720997 is an equidigital number, since it uses as much as digits as its factorization.

720997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 720997 is about 849.1154220717. The cubic root of 720997 is about 89.6694458554.

The spelling of 720997 in words is "seven hundred twenty thousand, nine hundred ninety-seven".