721306147 has 2 divisors, whose sum is σ = 721306148. Its totient is φ = 721306146.

The previous prime is 721306129. The next prime is 721306163. The reversal of 721306147 is 741603127.

721306147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (741603127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721306147 - 2¹¹ = 721304099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (721306247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360653073 + 360653074.

It is an arithmetic number, because the mean of its divisors is an integer number (360653074).

Almost surely, 2^721306147 is an apocalyptic number.

721306147 is a deficient number, since it is larger than the sum of its proper divisors (1).

721306147 is an equidigital number, since it uses as much as digits as its factorization.

721306147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 721306147 is about 26857.1433142097. The cubic root of 721306147 is about 896.8226009232.

The spelling of 721306147 in words is "seven hundred twenty-one million, three hundred six thousand, one hundred forty-seven".