12778097 has 4 divisors (see below), whose sum is σ = 12987636. Its totient is φ = 12568560.

The previous prime is 12778093. The next prime is 12778109. The reversal of 12778097 is 79087721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3297856 + 9480241 = 1816^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 12778097 - 2² = 12778093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12778093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104678 + ... + 104799.

It is an arithmetic number, because the mean of its divisors is an integer number (3246909).

Almost surely, 2^12778097 is an apocalyptic number.

It is an amenable number.

12778097 is a deficient number, since it is larger than the sum of its proper divisors (209539).

12778097 is an equidigital number, since it uses as much as digits as its factorization.

12778097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209538.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 12778097 is about 3574.6464160809. The cubic root of 12778097 is about 233.7879162949.

The spelling of 12778097 in words is "twelve million, seven hundred seventy-eight thousand, ninety-seven".