1163561013 has 6 divisors (see below), whose sum is σ = 1680699254. Its totient is φ = 775707336.

The previous prime is 1163561011. The next prime is 1163561023. The reversal of 1163561013 is 3101653611.

1163561013 is a `hidden beast` number, since 1 + 1 + 6 + 35 + 610 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 809857764 + 353703249 = 28458^2 + 18807^2 .

It is not a de Polignac number, because 1163561013 - 2¹ = 1163561011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163561011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64642270 + ... + 64642287.

Almost surely, 2^1163561013 is an apocalyptic number.

It is an amenable number.

1163561013 is a deficient number, since it is larger than the sum of its proper divisors (517138241).

1163561013 is a wasteful number, since it uses less digits than its factorization.

1163561013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129284563 (or 129284560 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1163561013 is about 34111.0101433540. The cubic root of 1163561013 is about 1051.7916540205.

The spelling of 1163561013 in words is "one billion, one hundred sixty-three million, five hundred sixty-one thousand, thirteen".