731132161 has 2 divisors, whose sum is σ = 731132162. Its totient is φ = 731132160.

The previous prime is 731132093. The next prime is 731132167. The reversal of 731132161 is 161231137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 700396225 + 30735936 = 26465^2 + 5544^2 .

It is a cyclic number.

It is not a de Polignac number, because 731132161 - 2⁷ = 731132033 is a prime.

It is not a weakly prime, because it can be changed into another prime (731132167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365566080 + 365566081.

It is an arithmetic number, because the mean of its divisors is an integer number (365566081).

Almost surely, 2^731132161 is an apocalyptic number.

It is an amenable number.

731132161 is a deficient number, since it is larger than the sum of its proper divisors (1).

731132161 is an equidigital number, since it uses as much as digits as its factorization.

731132161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 731132161 is about 27039.4556343134. The cubic root of 731132161 is about 900.8765784667.

Adding to 731132161 its reverse (161231137), we get a palindrome (892363298).

The spelling of 731132161 in words is "seven hundred thirty-one million, one hundred thirty-two thousand, one hundred sixty-one".