12781147 has 8 divisors (see below), whose sum is σ = 13070592. Its totient is φ = 12494400.

The previous prime is 12781117. The next prime is 12781159. The reversal of 12781147 is 74118721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12781147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12781117) 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 7 ways as a sum of consecutive naturals, for example, 11103 + ... + 12199.

It is an arithmetic number, because the mean of its divisors is an integer number (1633824).

Almost surely, 2^12781147 is an apocalyptic number.

12781147 is a deficient number, since it is larger than the sum of its proper divisors (289445).

12781147 is a wasteful number, since it uses less digits than its factorization.

12781147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its digits is 3136, while the sum is 31.

The square root of 12781147 is about 3575.0730062476. The cubic root of 12781147 is about 233.8065157368.

Adding to 12781147 its reverse (74118721), we get a palindrome (86899868).

The spelling of 12781147 in words is "twelve million, seven hundred eighty-one thousand, one hundred forty-seven".