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12130311 = 34043437
BaseRepresentation
bin101110010001…
…100000000111
3211211021122210
4232101200013
511101132221
61111554503
7205051224
oct56214007
924737583
1012130311
116935756
12408ba33
1326893cb
14187a94b
1510e9276
hexb91807

12130311 has 4 divisors (see below), whose sum is σ = 16173752. Its totient is φ = 8086872.

The previous prime is 12130309. The next prime is 12130319. The reversal of 12130311 is 11303121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11303121 = 33767707.

It is not a de Polignac number, because 12130311 - 21 = 12130309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12130319) 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, 2021716 + ... + 2021721.

It is an arithmetic number, because the mean of its divisors is an integer number (4043438).

Almost surely, 212130311 is an apocalyptic number.

12130311 is a deficient number, since it is larger than the sum of its proper divisors (4043441).

12130311 is an equidigital number, since it uses as much as digits as its factorization.

12130311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043440.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 12130311 is about 3482.8596009601. The cubic root of 12130311 is about 229.7685826095.

Adding to 12130311 its reverse (11303121), we get a palindrome (23433432).

It can be divided in two parts, 1 and 2130311, that added together give a palindrome (2130312).

The spelling of 12130311 in words is "twelve million, one hundred thirty thousand, three hundred eleven".

Divisors: 1 3 4043437 12130311