1561050561 has 8 divisors (see below), whose sum is σ = 2378743744. Its totient is φ = 892028880.

The previous prime is 1561050553. The next prime is 1561050577. The reversal of 1561050561 is 1650501651.

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

It is not a de Polignac number, because 1561050561 - 2³ = 1561050553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561050521) 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, 37167850 + ... + 37167891.

It is an arithmetic number, because the mean of its divisors is an integer number (297342968).

Almost surely, 2^1561050561 is an apocalyptic number.

It is an amenable number.

1561050561 is a deficient number, since it is larger than the sum of its proper divisors (817693183).

1561050561 is an equidigital number, since it uses as much as digits as its factorization.

1561050561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74335751.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1561050561 is about 39510.1323839847. The cubic root of 1561050561 is about 1160.0382867367.

The spelling of 1561050561 in words is "one billion, five hundred sixty-one million, fifty thousand, five hundred sixty-one".