3581945 has 4 divisors (see below), whose sum is σ = 4298340. Its totient is φ = 2865552.

The previous prime is 3581927. The next prime is 3581953. The reversal of 3581945 is 5491853.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5491853 = 1249 ⋅4397.

It can be written as a sum of positive squares in 2 ways, for example, as 2298256 + 1283689 = 1516^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 3581945 - 2⁶ = 3581881 is a prime.

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, 358190 + ... + 358199.

It is an arithmetic number, because the mean of its divisors is an integer number (1074585).

Almost surely, 2^3581945 is an apocalyptic number.

It is an amenable number.

3581945 is a deficient number, since it is larger than the sum of its proper divisors (716395).

3581945 is an equidigital number, since it uses as much as digits as its factorization.

3581945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716394.

The product of its digits is 21600, while the sum is 35.

The square root of 3581945 is about 1892.6027052712. The cubic root of 3581945 is about 153.0052399703.

The spelling of 3581945 in words is "three million, five hundred eighty-one thousand, nine hundred forty-five".