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13108213 = 31674139
BaseRepresentation
bin110010000000…
…001111110101
3220122222002101
4302000033311
511323430323
61144542101
7216263236
oct62001765
926588071
1013108213
117443438
124481931
13293c551
141a5308d
15123ddad
hexc803f5

13108213 has 4 divisors (see below), whose sum is σ = 13115520. Its totient is φ = 13100908.

The previous prime is 13108181. The next prime is 13108243. The reversal of 13108213 is 31280131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31280131 = 104929819.

It is a cyclic number.

It is not a de Polignac number, because 13108213 - 25 = 13108181 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 (13108243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1098 + ... + 5236.

It is an arithmetic number, because the mean of its divisors is an integer number (3278880).

Almost surely, 213108213 is an apocalyptic number.

It is an amenable number.

13108213 is a deficient number, since it is larger than the sum of its proper divisors (7307).

13108213 is an equidigital number, since it uses as much as digits as its factorization.

13108213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7306.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 13108213 is about 3620.5266191536. The cubic root of 13108213 is about 235.7840898514.

Adding to 13108213 its reverse (31280131), we get a palindrome (44388344).

The spelling of 13108213 in words is "thirteen million, one hundred eight thousand, two hundred thirteen".

Divisors: 1 3167 4139 13108213