712731161 has 4 divisors (see below), whose sum is σ = 715504692. Its totient is φ = 709957632.

The previous prime is 712731143. The next prime is 712731179. The reversal of 712731161 is 161137217.

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

It is an interprime number because it is at equal distance from previous prime (712731143) and next prime (712731179).

It can be written as a sum of positive squares in 2 ways, for example, as 395214400 + 317516761 = 19880^2 + 17819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-712731161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (712731101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386380 + ... + 1386893.

It is an arithmetic number, because the mean of its divisors is an integer number (178876173).

Almost surely, 2^712731161 is an apocalyptic number.

It is an amenable number.

712731161 is a deficient number, since it is larger than the sum of its proper divisors (2773531).

712731161 is a wasteful number, since it uses less digits than its factorization.

712731161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773530.

The product of its digits is 1764, while the sum is 29.

The square root of 712731161 is about 26697.0253211851. The cubic root of 712731161 is about 893.2545744252.

Adding to 712731161 its reverse (161137217), we get a palindrome (873868378).

The spelling of 712731161 in words is "seven hundred twelve million, seven hundred thirty-one thousand, one hundred sixty-one".