12681311 has 4 divisors (see below), whose sum is σ = 12741624. Its totient is φ = 12621000.

The previous prime is 12681307. The next prime is 12681329. The reversal of 12681311 is 11318621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11318621 = 127 ⋅89123.

It is a cyclic number.

It is not a de Polignac number, because 12681311 - 2² = 12681307 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 (12681391) 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, 29840 + ... + 30261.

It is an arithmetic number, because the mean of its divisors is an integer number (3185406).

Almost surely, 2^12681311 is an apocalyptic number.

12681311 is a deficient number, since it is larger than the sum of its proper divisors (60313).

12681311 is an equidigital number, since it uses as much as digits as its factorization.

12681311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60312.

The product of its digits is 288, while the sum is 23.

The square root of 12681311 is about 3561.0828409348. The cubic root of 12681311 is about 233.1961545145.

Adding to 12681311 its reverse (11318621), we get a palindrome (23999932).

The spelling of 12681311 in words is "twelve million, six hundred eighty-one thousand, three hundred eleven".