3581491609 has 4 divisors (see below), whose sum is σ = 3792167604. Its totient is φ = 3370815616.

The previous prime is 3581491591. The next prime is 3581491663. The reversal of 3581491609 is 9061941853.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1579824009 + 2001667600 = 39747^2 + 44740^2 .

It is a cyclic number.

It is not a de Polignac number, because 3581491609 - 2¹⁹ = 3580967321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3581491699) 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, 105337972 + ... + 105338005.

It is an arithmetic number, because the mean of its divisors is an integer number (948041901).

Almost surely, 2^3581491609 is an apocalyptic number.

It is an amenable number.

3581491609 is a deficient number, since it is larger than the sum of its proper divisors (210675995).

3581491609 is a wasteful number, since it uses less digits than its factorization.

3581491609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210675994.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 3581491609 is about 59845.5646560378. The cubic root of 3581491609 is about 1529.9878406199.

The spelling of 3581491609 in words is "three billion, five hundred eighty-one million, four hundred ninety-one thousand, six hundred nine".