12681329 has 2 divisors, whose sum is σ = 12681330. Its totient is φ = 12681328.

The previous prime is 12681307. The next prime is 12681353. The reversal of 12681329 is 92318621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 93025 = 3548^2 + 305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12681329 is a prime.

It is a super-2 number, since 2×12681329² = 321632210412482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12681295 and 12681304.

It is not a weakly prime, because it can be changed into another prime (12681629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6340664 + 6340665.

It is an arithmetic number, because the mean of its divisors is an integer number (6340665).

Almost surely, 2^12681329 is an apocalyptic number.

It is an amenable number.

12681329 is a deficient number, since it is larger than the sum of its proper divisors (1).

12681329 is an equidigital number, since it uses as much as digits as its factorization.

12681329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 12681329 is about 3561.0853682550. The cubic root of 12681329 is about 233.1962648482.

The spelling of 12681329 in words is "twelve million, six hundred eighty-one thousand, three hundred twenty-nine".