326101561 has 2 divisors, whose sum is σ = 326101562. Its totient is φ = 326101560.

The previous prime is 326101553. The next prime is 326101571. The reversal of 326101561 is 165101623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242269225 + 83832336 = 15565^2 + 9156^2 .

It is a cyclic number.

It is not a de Polignac number, because 326101561 - 2³ = 326101553 is a prime.

It is not a weakly prime, because it can be changed into another prime (326101571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163050780 + 163050781.

It is an arithmetic number, because the mean of its divisors is an integer number (163050781).

Almost surely, 2^326101561 is an apocalyptic number.

It is an amenable number.

326101561 is a deficient number, since it is larger than the sum of its proper divisors (1).

326101561 is an equidigital number, since it uses as much as digits as its factorization.

326101561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 326101561 is about 18058.2823380298. The cubic root of 326101561 is about 688.3103382083.

The spelling of 326101561 in words is "three hundred twenty-six million, one hundred one thousand, five hundred sixty-one".