724517161 has 2 divisors, whose sum is σ = 724517162. Its totient is φ = 724517160.

The previous prime is 724517147. The next prime is 724517243. The reversal of 724517161 is 161715427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444155625 + 280361536 = 21075^2 + 16744^2 .

It is an emirp because it is prime and its reverse (161715427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724517161 - 2⁹ = 724516649 is a prime.

It is not a weakly prime, because it can be changed into another prime (724517111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362258580 + 362258581.

It is an arithmetic number, because the mean of its divisors is an integer number (362258581).

Almost surely, 2^724517161 is an apocalyptic number.

It is an amenable number.

724517161 is a deficient number, since it is larger than the sum of its proper divisors (1).

724517161 is an equidigital number, since it uses as much as digits as its factorization.

724517161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 724517161 is about 26916.8564472154. The cubic root of 724517161 is about 898.1514159287.

The spelling of 724517161 in words is "seven hundred twenty-four million, five hundred seventeen thousand, one hundred sixty-one".