1561322041 has 16 divisors (see below), whose sum is σ = 1771680384. Its totient is φ = 1367587584.

The previous prime is 1561322033. The next prime is 1561322057. The reversal of 1561322041 is 1402231651.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1561322041 - 2³ = 1561322033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561321997 and 1561322015.

It is not an unprimeable number, because it can be changed into a prime (1561329041) 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 15 ways as a sum of consecutive naturals, for example, 39495 + ... + 68428.

It is an arithmetic number, because the mean of its divisors is an integer number (110730024).

Almost surely, 2^1561322041 is an apocalyptic number.

It is an amenable number.

1561322041 is a deficient number, since it is larger than the sum of its proper divisors (210358343).

1561322041 is a wasteful number, since it uses less digits than its factorization.

1561322041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108000.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1561322041 is about 39513.5678090450. The cubic root of 1561322041 is about 1160.1055296878.

Adding to 1561322041 its reverse (1402231651), we get a palindrome (2963553692).

The spelling of 1561322041 in words is "one billion, five hundred sixty-one million, three hundred twenty-two thousand, forty-one".