1561170041 has 4 divisors (see below), whose sum is σ = 1561302372. Its totient is φ = 1561037712.

The previous prime is 1561170019. The next prime is 1561170097. The reversal of 1561170041 is 1400711651.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 716686441 + 844483600 = 26771^2 + 29060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561170041 - 2⁶ = 1561169977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561175041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46526 + ... + 72711.

It is an arithmetic number, because the mean of its divisors is an integer number (390325593).

Almost surely, 2^1561170041 is an apocalyptic number.

It is an amenable number.

1561170041 is a deficient number, since it is larger than the sum of its proper divisors (132331).

1561170041 is a wasteful number, since it uses less digits than its factorization.

1561170041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132330.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 1561170041 is about 39511.6443722607. The cubic root of 1561170041 is about 1160.0678817291.

Adding to 1561170041 its reverse (1400711651), we get a palindrome (2961881692).

The spelling of 1561170041 in words is "one billion, five hundred sixty-one million, one hundred seventy thousand, forty-one".