1163928561 has 16 divisors (see below), whose sum is σ = 1570985280. Its totient is φ = 766430720.

The previous prime is 1163928533. The next prime is 1163928587. The reversal of 1163928561 is 1658293611.

It is a cyclic number.

It is not a de Polignac number, because 1163928561 - 2⁵ = 1163928529 is a prime.

It is a super-2 number, since 2×1163928561² = 2709459390223061442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1163928461) 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 15 ways as a sum of consecutive naturals, for example, 361786 + ... + 364988.

It is an arithmetic number, because the mean of its divisors is an integer number (98186580).

Almost surely, 2^1163928561 is an apocalyptic number.

It is an amenable number.

1163928561 is a deficient number, since it is larger than the sum of its proper divisors (407056719).

1163928561 is a wasteful number, since it uses less digits than its factorization.

1163928561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656.

The product of its digits is 77760, while the sum is 42.

The square root of 1163928561 is about 34116.3972453130. The cubic root of 1163928561 is about 1051.9023897180.

The spelling of 1163928561 in words is "one billion, one hundred sixty-three million, nine hundred twenty-eight thousand, five hundred sixty-one".