721073590109 has 2 divisors, whose sum is σ = 721073590110. Its totient is φ = 721073590108.

The previous prime is 721073590079. The next prime is 721073590117. The reversal of 721073590109 is 901095370127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 407560944025 + 313512646084 = 638405^2 + 559922^2 .

It is a cyclic number.

It is not a de Polignac number, because 721073590109 - 2²⁴ = 721056812893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721073590109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721072590109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360536795054 + 360536795055.

It is an arithmetic number, because the mean of its divisors is an integer number (360536795055).

Almost surely, 2^721073590109 is an apocalyptic number.

It is an amenable number.

721073590109 is a deficient number, since it is larger than the sum of its proper divisors (1).

721073590109 is an equidigital number, since it uses as much as digits as its factorization.

721073590109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 44.

The spelling of 721073590109 in words is "seven hundred twenty-one billion, seventy-three million, five hundred ninety thousand, one hundred nine".