731448161 has 4 divisors (see below), whose sum is σ = 738690324. Its totient is φ = 724206000.

The previous prime is 731448127. The next prime is 731448167. The reversal of 731448161 is 161844137.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 699919936 + 31528225 = 26456^2 + 5615^2 .

It is a cyclic number.

It is not a de Polignac number, because 731448161 - 2¹⁸ = 731186017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731448167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3620930 + ... + 3621131.

It is an arithmetic number, because the mean of its divisors is an integer number (184672581).

Almost surely, 2^731448161 is an apocalyptic number.

It is an amenable number.

731448161 is a deficient number, since it is larger than the sum of its proper divisors (7242163).

731448161 is a wasteful number, since it uses less digits than its factorization.

731448161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242162.

The product of its digits is 16128, while the sum is 35.

The square root of 731448161 is about 27045.2983159735. The cubic root of 731448161 is about 901.0063479806.

The spelling of 731448161 in words is "seven hundred thirty-one million, four hundred forty-eight thousand, one hundred sixty-one".