561155526 has 48 divisors (see below), whose sum is σ = 1278220944. Its totient is φ = 184477824.

The previous prime is 561155501. The next prime is 561155563. The reversal of 561155526 is 625551165.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27570 + ... + 43386.

It is an arithmetic number, because the mean of its divisors is an integer number (26629603).

Almost surely, 2^561155526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561155526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639110472).

561155526 is an abundant number, since it is smaller than the sum of its proper divisors (717065418).

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

561155526 is a wasteful number, since it uses less digits than its factorization.

561155526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15907 (or 15895 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 561155526 is about 23688.7214935716. The cubic root of 561155526 is about 824.8236052626.

The spelling of 561155526 in words is "five hundred sixty-one million, one hundred fifty-five thousand, five hundred twenty-six".