720941009 has 2 divisors, whose sum is σ = 720941010. Its totient is φ = 720941008.

The previous prime is 720940993. The next prime is 720941051. The reversal of 720941009 is 900149027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476112400 + 244828609 = 21820^2 + 15647^2 .

It is a cyclic number.

It is not a de Polignac number, because 720941009 - 2⁴ = 720940993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720941059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360470504 + 360470505.

It is an arithmetic number, because the mean of its divisors is an integer number (360470505).

Almost surely, 2^720941009 is an apocalyptic number.

It is an amenable number.

720941009 is a deficient number, since it is larger than the sum of its proper divisors (1).

720941009 is an equidigital number, since it uses as much as digits as its factorization.

720941009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 720941009 is about 26850.3446719032. The cubic root of 720941009 is about 896.6712461973.

The spelling of 720941009 in words is "seven hundred twenty million, nine hundred forty-one thousand, nine".