13771645 has 4 divisors (see below), whose sum is σ = 16525980. Its totient is φ = 11017312.

The previous prime is 13771643. The next prime is 13771661. The reversal of 13771645 is 54617731.

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 2232036 + 11539609 = 1494^2 + 3397^2 .

It is a cyclic number.

It is not a de Polignac number, because 13771645 - 2¹ = 13771643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13771645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13771643) 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, 1377160 + ... + 1377169.

It is an arithmetic number, because the mean of its divisors is an integer number (4131495).

Almost surely, 2^13771645 is an apocalyptic number.

It is an amenable number.

13771645 is a deficient number, since it is larger than the sum of its proper divisors (2754335).

13771645 is an equidigital number, since it uses as much as digits as its factorization.

13771645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754334.

The product of its digits is 17640, while the sum is 34.

The square root of 13771645 is about 3711.0167070494. The cubic root of 13771645 is about 239.6966363813.

The spelling of 13771645 in words is "thirteen million, seven hundred seventy-one thousand, six hundred forty-five".