731123 has 4 divisors (see below), whose sum is σ = 732840. Its totient is φ = 729408.

The previous prime is 731117. The next prime is 731141. The reversal of 731123 is 321137.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 321137 = 59 ⋅5443.

It is a cyclic number.

It is not a de Polignac number, because 731123 - 2⁸ = 730867 is a prime.

It is a super-2 number, since 2×731123² = 1069081682258, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731113) 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, 323 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (183210).

2⁷³¹¹²³ is an apocalyptic number.

731123 is a deficient number, since it is larger than the sum of its proper divisors (1717).

731123 is an equidigital number, since it uses as much as digits as its factorization.

731123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 126, while the sum is 17.

The square root of 731123 is about 855.0573080209. The cubic root of 731123 is about 90.0872815825.

The spelling of 731123 in words is "seven hundred thirty-one thousand, one hundred twenty-three".