13143745 has 4 divisors (see below), whose sum is σ = 15772500. Its totient is φ = 10514992.

The previous prime is 13143743. The next prime is 13143749. The reversal of 13143745 is 54734131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54734131 = 3391 ⋅16141.

It can be written as a sum of positive squares in 2 ways, for example, as 7890481 + 5253264 = 2809^2 + 2292^2 .

It is a cyclic number.

It is not a de Polignac number, because 13143745 - 2¹ = 13143743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13143743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314370 + ... + 1314379.

It is an arithmetic number, because the mean of its divisors is an integer number (3943125).

Almost surely, 2^13143745 is an apocalyptic number.

It is an amenable number.

13143745 is a deficient number, since it is larger than the sum of its proper divisors (2628755).

13143745 is an equidigital number, since it uses as much as digits as its factorization.

13143745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628754.

The product of its digits is 5040, while the sum is 28.

The square root of 13143745 is about 3625.4303192862. The cubic root of 13143745 is about 235.9969416917.

Adding to 13143745 its reverse (54734131), we get a palindrome (67877876).

The spelling of 13143745 in words is "thirteen million, one hundred forty-three thousand, seven hundred forty-five".