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30031 = 59509
BaseRepresentation
bin111010101001111
31112012021
413111033
51430111
6351011
7153361
oct72517
945167
1030031
1120621
1215467
1310891
14ad31
158d71
hex754f

30031 has 4 divisors (see below), whose sum is σ = 30600. Its totient is φ = 29464.

The previous prime is 30029. The next prime is 30047. The reversal of 30031 is 13003.

Adding to 30031 its reverse (13003), we get a palindrome (43034).

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30031 - 21 = 30029 is a prime.

It is a super-2 number, since 2×300312 = 1803721922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29996 and 30023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30011) 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, 196 + ... + 313.

It is an arithmetic number, because the mean of its divisors is an integer number (7650).

230031 is an apocalyptic number.

30031 is the 78-th centered decagonal number.

30031 is a deficient number, since it is larger than the sum of its proper divisors (569).

30031 is an equidigital number, since it uses as much as digits as its factorization.

30031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568.

The product of its (nonzero) digits is 9, while the sum is 7.

The square root of 30031 is about 173.2945469425. The cubic root of 30031 is about 31.0830240649.

The spelling of 30031 in words is "thirty thousand, thirty-one".

Divisors: 1 59 509 30031