8561831490 has 128 divisors (see below), whose sum is σ = 24208128000. Its totient is φ = 2147249088.

The previous prime is 8561831459. The next prime is 8561831491. The reversal of 8561831490 is 941381658.

8561831490 is a `hidden beast` number, since 8 + 561 + 83 + 1 + 4 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (8561831491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 707067 + ... + 719073.

It is an arithmetic number, because the mean of its divisors is an integer number (189126000).

Almost surely, 2^8561831490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8561831490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12104064000).

8561831490 is an abundant number, since it is smaller than the sum of its proper divisors (15646296510).

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

8561831490 is a wasteful number, since it uses less digits than its factorization.

8561831490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12181 (or 12175 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 8561831490 is about 92530.1652975936. The cubic root of 8561831490 is about 2045.7641260233.

The spelling of 8561831490 in words is "eight billion, five hundred sixty-one million, eight hundred thirty-one thousand, four hundred ninety".