721675847 has 2 divisors, whose sum is σ = 721675848. Its totient is φ = 721675846.

The previous prime is 721675739. The next prime is 721675897. The reversal of 721675847 is 748576127.

It is a happy number.

721675847 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 a cyclic number.

It is not a de Polignac number, because 721675847 - 2¹⁸ = 721413703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721675897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837923 + 360837924.

It is an arithmetic number, because the mean of its divisors is an integer number (360837924).

Almost surely, 2^721675847 is an apocalyptic number.

721675847 is a deficient number, since it is larger than the sum of its proper divisors (1).

721675847 is an equidigital number, since it uses as much as digits as its factorization.

721675847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 47.

The square root of 721675847 is about 26864.0251451639. The cubic root of 721675847 is about 896.9757946296.

The spelling of 721675847 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, eight hundred forty-seven".