731543161 has 2 divisors, whose sum is σ = 731543162. Its totient is φ = 731543160.

The previous prime is 731543123. The next prime is 731543261. The reversal of 731543161 is 161345137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451817536 + 279725625 = 21256^2 + 16725^2 .

It is an emirp because it is prime and its reverse (161345137) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731543161 is a prime.

It is not a weakly prime, because it can be changed into another prime (731543261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365771580 + 365771581.

It is an arithmetic number, because the mean of its divisors is an integer number (365771581).

Almost surely, 2^731543161 is an apocalyptic number.

It is an amenable number.

731543161 is a deficient number, since it is larger than the sum of its proper divisors (1).

731543161 is an equidigital number, since it uses as much as digits as its factorization.

731543161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 731543161 is about 27047.0545716165. The cubic root of 731543161 is about 901.0453536601.

Adding to 731543161 its reverse (161345137), we get a palindrome (892888298).

The spelling of 731543161 in words is "seven hundred thirty-one million, five hundred forty-three thousand, one hundred sixty-one".