3261605 has 4 divisors (see below), whose sum is σ = 3913932. Its totient is φ = 2609280.

The previous prime is 3261581. The next prime is 3261617. The reversal of 3261605 is 5061623.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5061623 = 7 ⋅723089.

It can be written as a sum of positive squares in 2 ways, for example, as 2217121 + 1044484 = 1489^2 + 1022^2 .

It is not a de Polignac number, because 3261605 - 2¹² = 3257509 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 326156 + ... + 326165.

It is an arithmetic number, because the mean of its divisors is an integer number (978483).

Almost surely, 2^3261605 is an apocalyptic number.

It is an amenable number.

3261605 is a deficient number, since it is larger than the sum of its proper divisors (652327).

3261605 is an equidigital number, since it uses as much as digits as its factorization.

3261605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652326.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 3261605 is about 1805.9914174768. The cubic root of 3261605 is about 148.3009004825.

The spelling of 3261605 in words is "three million, two hundred sixty-one thousand, six hundred five".