813731 has 8 divisors (see below), whose sum is σ = 841824. Its totient is φ = 786240.

The previous prime is 813721. The next prime is 813749. The reversal of 813731 is 137318.

It is a happy number.

813731 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 813731 - 2¹⁸ = 551587 is a prime.

It is a super-2 number, since 2×813731² = 1324316280722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 813697 and 813706.

It is not an unprimeable number, because it can be changed into a prime (813721) 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, 5105 + ... + 5261.

It is an arithmetic number, because the mean of its divisors is an integer number (105228).

2⁸¹³⁷³¹ is an apocalyptic number.

813731 is a deficient number, since it is larger than the sum of its proper divisors (28093).

813731 is a wasteful number, since it uses less digits than its factorization.

813731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301.

The product of its digits is 504, while the sum is 23.

The square root of 813731 is about 902.0703963660. The cubic root of 813731 is about 93.3598804869.

The spelling of 813731 in words is "eight hundred thirteen thousand, seven hundred thirty-one".