13601645 has 4 divisors (see below), whose sum is σ = 16321980. Its totient is φ = 10881312.

The previous prime is 13601633. The next prime is 13601647. The reversal of 13601645 is 54610631.

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 5654884 + 7946761 = 2378^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 13601645 - 2⁴ = 13601629 is a prime.

It is a super-3 number, since 3×13601645³ (a number of 22 digits) contains 333 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 (13601647) 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, 1360160 + ... + 1360169.

It is an arithmetic number, because the mean of its divisors is an integer number (4080495).

Almost surely, 2^13601645 is an apocalyptic number.

It is an amenable number.

13601645 is a deficient number, since it is larger than the sum of its proper divisors (2720335).

13601645 is an equidigital number, since it uses as much as digits as its factorization.

13601645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720334.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13601645 is about 3688.0408078003. The cubic root of 13601645 is about 238.7062619183.

The spelling of 13601645 in words is "thirteen million, six hundred one thousand, six hundred forty-five".