326257561 has 8 divisors (see below), whose sum is σ = 373091840. Its totient is φ = 279479808.

The previous prime is 326257543. The next prime is 326257571. The reversal of 326257561 is 165752623.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 326257561 - 2¹¹ = 326255513 is a prime.

It is a super-2 number, since 2×326257561² = 212887992219337442, 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 326257561.

It is not an unprimeable number, because it can be changed into a prime (326257571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (46636480).

Almost surely, 2^326257561 is an apocalyptic number.

It is an amenable number.

326257561 is a deficient number, since it is larger than the sum of its proper divisors (46834279).

326257561 is a wasteful number, since it uses less digits than its factorization.

326257561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28263.

The product of its digits is 75600, while the sum is 37.

The square root of 326257561 is about 18062.6011692668. The cubic root of 326257561 is about 688.4200783506.

It can be divided in two parts, 32625 and 7561, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 326257561 in words is "three hundred twenty-six million, two hundred fifty-seven thousand, five hundred sixty-one".