13661245 has 8 divisors (see below), whose sum is σ = 17654616. Its totient is φ = 10088256.

The previous prime is 13661237. The next prime is 13661261. The reversal of 13661245 is 54216631.

13661245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 894916 + 12766329 = 946^2 + 3573^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13661245 - 2³ = 13661237 is a prime.

It is a super-2 number, since 2×13661245² = 373259229900050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105022 + ... + 105151.

It is an arithmetic number, because the mean of its divisors is an integer number (2206827).

Almost surely, 2^13661245 is an apocalyptic number.

It is an amenable number.

13661245 is a deficient number, since it is larger than the sum of its proper divisors (3993371).

13661245 is a wasteful number, since it uses less digits than its factorization.

13661245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210191.

The product of its digits is 4320, while the sum is 28.

The square root of 13661245 is about 3696.1121465670. The cubic root of 13661245 is about 239.0544100955.

Adding to 13661245 its reverse (54216631), we get a palindrome (67877876).

The spelling of 13661245 in words is "thirteen million, six hundred sixty-one thousand, two hundred forty-five".