671035721 has 2 divisors, whose sum is σ = 671035722. Its totient is φ = 671035720.

The previous prime is 671035709. The next prime is 671035751. The reversal of 671035721 is 127530176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659719225 + 11316496 = 25685^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 671035721 - 2⁶ = 671035657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671035751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335517860 + 335517861.

It is an arithmetic number, because the mean of its divisors is an integer number (335517861).

Almost surely, 2^671035721 is an apocalyptic number.

It is an amenable number.

671035721 is a deficient number, since it is larger than the sum of its proper divisors (1).

671035721 is an equidigital number, since it uses as much as digits as its factorization.

671035721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 671035721 is about 25904.3571817561. The cubic root of 671035721 is about 875.4846712413.

Adding to 671035721 its reverse (127530176), we get a palindrome (798565897).

The spelling of 671035721 in words is "six hundred seventy-one million, thirty-five thousand, seven hundred twenty-one".