1561056601 has 8 divisors (see below), whose sum is σ = 1704168200. Its totient is φ = 1421235072.

The previous prime is 1561056557. The next prime is 1561056617. The reversal of 1561056601 is 1066501651.

It can be written as a sum of positive squares in 4 ways, for example, as 8696601 + 1552360000 = 2949^2 + 39400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561056601 - 2⁹ = 1561056089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561056641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821526 + ... + 823423.

It is an arithmetic number, because the mean of its divisors is an integer number (213021025).

Almost surely, 2^1561056601 is an apocalyptic number.

It is an amenable number.

1561056601 is a deficient number, since it is larger than the sum of its proper divisors (143111599).

1561056601 is a wasteful number, since it uses less digits than its factorization.

1561056601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645035.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1561056601 is about 39510.2088199999. The cubic root of 1561056601 is about 1160.0397828706.

The spelling of 1561056601 in words is "one billion, five hundred sixty-one million, fifty-six thousand, six hundred one".