561131020326 has 64 divisors (see below), whose sum is σ = 1211288250816. Its totient is φ = 172635340800.

The previous prime is 561131020279. The next prime is 561131020337. The reversal of 561131020326 is 623020131165.

It is a junction number, because it is equal to n+sod(n) for n = 561131020293 and 561131020302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11550006 + ... + 11598486.

It is an arithmetic number, because the mean of its divisors is an integer number (18926378919).

Almost surely, 2^561131020326 is an apocalyptic number.

561131020326 is an abundant number, since it is smaller than the sum of its proper divisors (650157230490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561131020326 is a wasteful number, since it uses less digits than its factorization.

561131020326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50697.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 561131020326 in words is "five hundred sixty-one billion, one hundred thirty-one million, twenty thousand, three hundred twenty-six".