13785169 has 2 divisors, whose sum is σ = 13785170. Its totient is φ = 13785168.

The previous prime is 13785133. The next prime is 13785197. The reversal of 13785169 is 96158731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9684544 + 4100625 = 3112^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 13785169 - 2⁷ = 13785041 is a prime.

It is a super-4 number, since 4×13785169⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (13785199) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6892584 + 6892585.

It is an arithmetic number, because the mean of its divisors is an integer number (6892585).

Almost surely, 2^13785169 is an apocalyptic number.

It is an amenable number.

13785169 is a deficient number, since it is larger than the sum of its proper divisors (1).

13785169 is an equidigital number, since it uses as much as digits as its factorization.

13785169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 13785169 is about 3712.8384020854. The cubic root of 13785169 is about 239.7750728297.

The spelling of 13785169 in words is "thirteen million, seven hundred eighty-five thousand, one hundred sixty-nine".