3457968721 has 2 divisors, whose sum is σ = 3457968722. Its totient is φ = 3457968720.

The previous prime is 3457968677. The next prime is 3457968751. The reversal of 3457968721 is 1278697543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2099014225 + 1358954496 = 45815^2 + 36864^2 .

It is an emirp because it is prime and its reverse (1278697543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3457968721 is a prime.

It is not a weakly prime, because it can be changed into another prime (3457968751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1728984360 + 1728984361.

It is an arithmetic number, because the mean of its divisors is an integer number (1728984361).

Almost surely, 2^3457968721 is an apocalyptic number.

It is an amenable number.

3457968721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3457968721 is an equidigital number, since it uses as much as digits as its factorization.

3457968721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 3457968721 is about 58804.4957550016. The cubic root of 3457968721 is about 1512.1922925339.

The spelling of 3457968721 in words is "three billion, four hundred fifty-seven million, nine hundred sixty-eight thousand, seven hundred twenty-one".