723131 has 8 divisors (see below), whose sum is σ = 753984. Its totient is φ = 693000.

The previous prime is 723127. The next prime is 723133. The reversal of 723131 is 131327.

723131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 723131 - 2² = 723127 is a prime.

It is a super-2 number, since 2×723131² = 1045836886322, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 723131.

It is not an unprimeable number, because it can be changed into a prime (723133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2756 + ... + 3006.

It is an arithmetic number, because the mean of its divisors is an integer number (94248).

2⁷²³¹³¹ is an apocalyptic number.

723131 is a deficient number, since it is larger than the sum of its proper divisors (30853).

723131 is a wasteful number, since it uses less digits than its factorization.

723131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

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

The square root of 723131 is about 850.3710954636. The cubic root of 723131 is about 89.7578263052.

Adding to 723131 its reverse (131327), we get a palindrome (854458).

The spelling of 723131 in words is "seven hundred twenty-three thousand, one hundred thirty-one".