3215518561 has 4 divisors (see below), whose sum is σ = 3384756400. Its totient is φ = 3046280724.

The previous prime is 3215518529. The next prime is 3215518573. The reversal of 3215518561 is 1658155123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1658155123 = 23 ⋅72093701.

It is a cyclic number.

It is not a de Polignac number, because 3215518561 - 2⁵ = 3215518529 is a prime.

It is a super-2 number, since 2×3215518561² = 20679119232271021442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3215518561.

It is not an unprimeable number, because it can be changed into a prime (3215518591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84618891 + ... + 84618928.

It is an arithmetic number, because the mean of its divisors is an integer number (846189100).

Almost surely, 2^3215518561 is an apocalyptic number.

It is an amenable number.

3215518561 is a deficient number, since it is larger than the sum of its proper divisors (169237839).

3215518561 is a wasteful number, since it uses less digits than its factorization.

3215518561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169237838.

The product of its digits is 36000, while the sum is 37.

The square root of 3215518561 is about 56705.5425950586. The cubic root of 3215518561 is about 1475.9908785420.

The spelling of 3215518561 in words is "three billion, two hundred fifteen million, five hundred eighteen thousand, five hundred sixty-one".