731161 has 4 divisors (see below), whose sum is σ = 733824. Its totient is φ = 728500.

The previous prime is 731141. The next prime is 731173. The reversal of 731161 is 161137.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 731161 - 2⁷ = 731033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731141) 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, 865 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

2⁷³¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

731161 is a deficient number, since it is larger than the sum of its proper divisors (2663).

731161 is a wasteful number, since it uses less digits than its factorization.

731161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662.

The product of its digits is 126, while the sum is 19.

The square root of 731161 is about 855.0795284650. The cubic root of 731161 is about 90.0888423128.

Adding to 731161 its reverse (161137), we get a palindrome (892298).

The spelling of 731161 in words is "seven hundred thirty-one thousand, one hundred sixty-one".