1561160811 has 32 divisors (see below), whose sum is σ = 2491711488. Its totient is φ = 850085280.

The previous prime is 1561160801. The next prime is 1561160819. The reversal of 1561160811 is 1180611651.

It is not a de Polignac number, because 1561160811 - 2⁶ = 1561160747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561160819) 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 31 ways as a sum of consecutive naturals, for example, 124930 + ... + 136856.

It is an arithmetic number, because the mean of its divisors is an integer number (77865984).

Almost surely, 2^1561160811 is an apocalyptic number.

1561160811 is a deficient number, since it is larger than the sum of its proper divisors (930550677).

1561160811 is a wasteful number, since it uses less digits than its factorization.

1561160811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231.

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 1561160811 is about 39511.5275710773. The cubic root of 1561160811 is about 1160.0655955277.

The spelling of 1561160811 in words is "one billion, five hundred sixty-one million, one hundred sixty thousand, eight hundred eleven".