3291209160561 has 27 divisors (see below), whose sum is σ = 5530190971851. Its totient is φ = 1880669178864.

The previous prime is 3291209160509. The next prime is 3291209160583. The reversal of 3291209160561 is 1650619021923.

The square root of 3291209160561 is 1814169.

It is a perfect power (a square), and thus also a powerful number.

3291209160561 is a `hidden beast` number, since 3 + 2 + 9 + 1 + 20 + 9 + 1 + 60 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 166163032161 + 3125046128400 = 407631^2 + 1767780^2 .

It is not a de Polignac number, because 3291209160561 - 2¹¹ = 3291209158513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3291209360561) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 38054355 + ... + 38140743.

Almost surely, 2^{3291209160561} is an apocalyptic number.

3291209160561 is the 1814169-th square number.

3291209160561 is the 907085-th centered octagonal number.

It is an amenable number.

3291209160561 is a deficient number, since it is larger than the sum of its proper divisors (2238981811290).

3291209160561 is an frugal number, since it uses more digits than its factorization.

3291209160561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172798 (or 86399 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 3291209160561 in words is "three trillion, two hundred ninety-one billion, two hundred nine million, one hundred sixty thousand, five hundred sixty-one".