3661613 has 4 divisors (see below), whose sum is σ = 3877020. Its totient is φ = 3446208.

The previous prime is 3661601. The next prime is 3661633. The reversal of 3661613 is 3161663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3161663 = 67 ⋅47189.

It can be written as a sum of positive squares in 2 ways, for example, as 3087049 + 574564 = 1757^2 + 758^2 .

It is a cyclic number.

It is not a de Polignac number, because 3661613 - 2⁴ = 3661597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661633) 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, 107678 + ... + 107711.

It is an arithmetic number, because the mean of its divisors is an integer number (969255).

Almost surely, 2^3661613 is an apocalyptic number.

It is an amenable number.

3661613 is a deficient number, since it is larger than the sum of its proper divisors (215407).

3661613 is a wasteful number, since it uses less digits than its factorization.

3661613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215406.

The product of its digits is 1944, while the sum is 26.

The square root of 3661613 is about 1913.5341648374. The cubic root of 3661613 is about 154.1312901865.

The spelling of 3661613 in words is "three million, six hundred sixty-one thousand, six hundred thirteen".