721341073 has 2 divisors, whose sum is σ = 721341074. Its totient is φ = 721341072.

The previous prime is 721341029. The next prime is 721341079. The reversal of 721341073 is 370143127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483472144 + 237868929 = 21988^2 + 15423^2 .

It is an emirp because it is prime and its reverse (370143127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721341073 - 2¹³ = 721332881 is a prime.

It is not a weakly prime, because it can be changed into another prime (721341079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360670536 + 360670537.

It is an arithmetic number, because the mean of its divisors is an integer number (360670537).

Almost surely, 2^721341073 is an apocalyptic number.

It is an amenable number.

721341073 is a deficient number, since it is larger than the sum of its proper divisors (1).

721341073 is an equidigital number, since it uses as much as digits as its factorization.

721341073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 721341073 is about 26857.7935244130. The cubic root of 721341073 is about 896.8370755541.

The spelling of 721341073 in words is "seven hundred twenty-one million, three hundred forty-one thousand, seventy-three".