3506591 has 4 divisors (see below), whose sum is σ = 3825384. Its totient is φ = 3187800.

The previous prime is 3506567. The next prime is 3506663. The reversal of 3506591 is 1956053.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1956053 = 11 ⋅177823.

It is not a de Polignac number, because 3506591 - 2¹⁸ = 3244447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3506291) 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, 159380 + ... + 159401.

It is an arithmetic number, because the mean of its divisors is an integer number (956346).

Almost surely, 2^3506591 is an apocalyptic number.

3506591 is a deficient number, since it is larger than the sum of its proper divisors (318793).

3506591 is a wasteful number, since it uses less digits than its factorization.

3506591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318792.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 3506591 is about 1872.5893837144. The cubic root of 3506591 is about 151.9246943455.

The spelling of 3506591 in words is "three million, five hundred six thousand, five hundred ninety-one".