607721 has 2 divisors, whose sum is σ = 607722. Its totient is φ = 607720.

The previous prime is 607703. The next prime is 607723. The reversal of 607721 is 127706.

It is a happy number.

607721 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 can be written as a sum of positive squares in only one way, i.e., 583696 + 24025 = 764^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 607721 - 2¹⁸ = 345577 is a prime.

It is a super-3 number, since 3×607721³ = 673339335576799083, which contains 333 as substring.

Together with 607723, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 607721.

It is not a weakly prime, because it can be changed into another prime (607723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303860 + 303861.

It is an arithmetic number, because the mean of its divisors is an integer number (303861).

2⁶⁰⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

607721 is a deficient number, since it is larger than the sum of its proper divisors (1).

607721 is an equidigital number, since it uses as much as digits as its factorization.

607721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 607721 is about 779.5646220808. The cubic root of 607721 is about 84.7035114264.

The spelling of 607721 in words is "six hundred seven thousand, seven hundred twenty-one".