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BaseRepresentation
bin101101110001…
…101100011111
3211120122221121
4231301230133
511033000111
61105111411
7203666341
oct55615437
924518847
1012000031
11685688a
124028567
132642014
141845291
1510c0871
hexb71b1f

12000031 has 4 divisors (see below), whose sum is σ = 12009312. Its totient is φ = 11990752.

The previous prime is 12000029. The next prime is 12000073. The reversal of 12000031 is 13000021.

Adding to 12000031 its reverse (13000021), we get a palindrome (25000052).

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: 13000021 = 27494729.

It is a cyclic number.

It is not a de Polignac number, because 12000031 - 21 = 12000029 is a prime.

It is a super-2 number, since 2×120000312 = 288001488001922, 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 = 11999978 and 12000023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000091) 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, 2311 + ... + 5416.

It is an arithmetic number, because the mean of its divisors is an integer number (3002328).

Almost surely, 212000031 is an apocalyptic number.

12000031 is a deficient number, since it is larger than the sum of its proper divisors (9281).

12000031 is an equidigital number, since it uses as much as digits as its factorization.

12000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9280.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 12000031 is about 3464.1060895995. The cubic root of 12000031 is about 228.9430456557.

The spelling of 12000031 in words is "twelve million, thirty-one", and thus it is an aban number and an uban number.

Divisors: 1 1553 7727 12000031