326316561 has 4 divisors (see below), whose sum is σ = 435088752. Its totient is φ = 217544372.

The previous prime is 326316553. The next prime is 326316563. The reversal of 326316561 is 165613623.

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.

It is a cyclic number.

It is not a de Polignac number, because 326316561 - 2³ = 326316553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (326316563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54386091 + ... + 54386096.

It is an arithmetic number, because the mean of its divisors is an integer number (108772188).

Almost surely, 2^326316561 is an apocalyptic number.

It is an amenable number.

326316561 is a deficient number, since it is larger than the sum of its proper divisors (108772191).

326316561 is a wasteful number, since it uses less digits than its factorization.

326316561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108772190.

The product of its digits is 19440, while the sum is 33.

The square root of 326316561 is about 18064.2343042820. The cubic root of 326316561 is about 688.4615735182.

The spelling of 326316561 in words is "three hundred twenty-six million, three hundred sixteen thousand, five hundred sixty-one".