12771645 has 16 divisors (see below), whose sum is σ = 20910912. Its totient is φ = 6652800.

The previous prime is 12771643. The next prime is 12771653. The reversal of 12771645 is 54617721.

12771645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12771645 - 2¹ = 12771643 is a prime.

It is a super-2 number, since 2×12771645² = 326229832012050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12771643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9256 + ... + 10545.

It is an arithmetic number, because the mean of its divisors is an integer number (1306932).

Almost surely, 2^12771645 is an apocalyptic number.

12771645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12771645 is a deficient number, since it is larger than the sum of its proper divisors (8139267).

12771645 is a wasteful number, since it uses less digits than its factorization.

12771645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19852.

The product of its digits is 11760, while the sum is 33.

The square root of 12771645 is about 3573.7438352518. The cubic root of 12771645 is about 233.7485610976.

The spelling of 12771645 in words is "twelve million, seven hundred seventy-one thousand, six hundred forty-five".