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320031 = 36439
BaseRepresentation
bin1001110001000011111
3121021000000
41032020133
540220111
610505343
72502015
oct1161037
9537000
10320031
111a9498
12135253
13b288a
14848b5
1564c56
hex4e21f

320031 has 14 divisors (see below), whose sum is σ = 480920. Its totient is φ = 212868.

The previous prime is 320027. The next prime is 320039. The reversal of 320031 is 130023.

It is a happy number.

It is not a de Polignac number, because 320031 - 22 = 320027 is a prime.

It is a super-2 number, since 2×3200312 = 204839681922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an Ulam number.

It is a Duffinian number.

320031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 319995 and 320022.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320031.

It is not an unprimeable number, because it can be changed into a prime (320039) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 510 + ... + 948.

2320031 is an apocalyptic number.

320031 is a deficient number, since it is larger than the sum of its proper divisors (160889).

320031 is an frugal number, since it uses more digits than its factorization.

320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 320031 is about 565.7128246734. The cubic root of 320031 is about 68.4012465147.

Adding to 320031 its reverse (130023), we get a palindrome (450054).

The spelling of 320031 in words is "three hundred twenty thousand, thirty-one".

Divisors: 1 3 9 27 81 243 439 729 1317 3951 11853 35559 106677 320031