1561727056 has 20 divisors (see below), whose sum is σ = 3030184404. Its totient is φ = 779744000.

The previous prime is 1561727051. The next prime is 1561727077. The reversal of 1561727056 is 6507271651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1427630656 + 134096400 = 37784^2 + 11580^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561727051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58405 + ... + 80836.

Almost surely, 2^1561727056 is an apocalyptic number.

1561727056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561727056 is a deficient number, since it is larger than the sum of its proper divisors (1468457348).

1561727056 is a wasteful number, since it uses less digits than its factorization.

1561727056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139950 (or 139944 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 1561727056 is about 39518.6924884921. The cubic root of 1561727056 is about 1160.2058334702.

The spelling of 1561727056 in words is "one billion, five hundred sixty-one million, seven hundred twenty-seven thousand, fifty-six".