3661513 has 4 divisors (see below), whose sum is σ = 3676948. Its totient is φ = 3646080.

The previous prime is 3661507. The next prime is 3661517. The reversal of 3661513 is 3151663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3151663 = 19 ⋅165877.

It can be written as a sum of positive squares in 2 ways, for example, as 3286969 + 374544 = 1813^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 3661513 - 2²¹ = 1564361 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661517) 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, 7356 + ... + 7837.

It is an arithmetic number, because the mean of its divisors is an integer number (919237).

Almost surely, 2^3661513 is an apocalyptic number.

It is an amenable number.

3661513 is a deficient number, since it is larger than the sum of its proper divisors (15435).

3661513 is a wasteful number, since it uses less digits than its factorization.

3661513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15434.

The product of its digits is 1620, while the sum is 25.

The square root of 3661513 is about 1913.5080349975. The cubic root of 3661513 is about 154.1298870463.

The spelling of 3661513 in words is "three million, six hundred sixty-one thousand, five hundred thirteen".