722240009 has 2 divisors, whose sum is σ = 722240010. Its totient is φ = 722240008.

The previous prime is 722239979. The next prime is 722240011. The reversal of 722240009 is 900042227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474019984 + 248220025 = 21772^2 + 15755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722240009 is a prime.

Together with 722240011, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_37344023 and since 722240009 and 37344023 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 722240009.

It is not a weakly prime, because it can be changed into another prime (722240039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361120004 + 361120005.

It is an arithmetic number, because the mean of its divisors is an integer number (361120005).

Almost surely, 2^722240009 is an apocalyptic number.

It is an amenable number.

722240009 is a deficient number, since it is larger than the sum of its proper divisors (1).

722240009 is an equidigital number, since it uses as much as digits as its factorization.

722240009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 722240009 is about 26874.5234190302. The cubic root of 722240009 is about 897.2094673392.

The spelling of 722240009 in words is "seven hundred twenty-two million, two hundred forty thousand, nine".