3215604561 has 16 divisors (see below), whose sum is σ = 4632047616. Its totient is φ = 1972503936.

The previous prime is 3215604559. The next prime is 3215604577. The reversal of 3215604561 is 1654065123.

It is not a de Polignac number, because 3215604561 - 2¹ = 3215604559 is a prime.

It is a super-2 number, since 2×3215604561² = 20680225385448005442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3215604661) 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 15 ways as a sum of consecutive naturals, for example, 119505 + ... + 143918.

It is an arithmetic number, because the mean of its divisors is an integer number (289502976).

Almost surely, 2^3215604561 is an apocalyptic number.

It is an amenable number.

3215604561 is a deficient number, since it is larger than the sum of its proper divisors (1416443055).

3215604561 is a wasteful number, since it uses less digits than its factorization.

3215604561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263752.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 3215604561 is about 56706.3008932870. The cubic root of 3215604561 is about 1476.0040370297.

Adding to 3215604561 its reverse (1654065123), we get a palindrome (4869669684).

The spelling of 3215604561 in words is "three billion, two hundred fifteen million, six hundred four thousand, five hundred sixty-one".