561631556 has 12 divisors (see below), whose sum is σ = 983056620. Its totient is φ = 280758240.

The previous prime is 561631537. The next prime is 561631573. The reversal of 561631556 is 655136165.

It can be written as a sum of positive squares in 2 ways, for example, as 369254656 + 192376900 = 19216^2 + 13870^2 .

It is a super-3 number, since 3×561631556³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13646 + ... + 36186.

It is an arithmetic number, because the mean of its divisors is an integer number (81921385).

Almost surely, 2^561631556 is an apocalyptic number.

It is an amenable number.

561631556 is a deficient number, since it is larger than the sum of its proper divisors (421425064).

561631556 is a wasteful number, since it uses less digits than its factorization.

561631556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28774 (or 28772 counting only the distinct ones).

The product of its digits is 81000, while the sum is 38.

The square root of 561631556 is about 23698.7669721444. The cubic root of 561631556 is about 825.0567728301.

The spelling of 561631556 in words is "five hundred sixty-one million, six hundred thirty-one thousand, five hundred fifty-six".