1163561320 has 16 divisors (see below), whose sum is σ = 2618013060. Its totient is φ = 465424512.

The previous prime is 1163561317. The next prime is 1163561323. The reversal of 1163561320 is 231653611.

It is an interprime number because it is at equal distance from previous prime (1163561317) and next prime (1163561323).

It can be written as a sum of positive squares in 2 ways, for example, as 1153689156 + 9872164 = 33966^2 + 3142^2 .

It is not an unprimeable number, because it can be changed into a prime (1163561323) 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 3 ways as a sum of consecutive naturals, for example, 14544477 + ... + 14544556.

Almost surely, 2^1163561320 is an apocalyptic number.

1163561320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1163561320 is an abundant number, since it is smaller than the sum of its proper divisors (1454451740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1163561320 is a wasteful number, since it uses less digits than its factorization.

1163561320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29089044 (or 29089040 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1163561320 is about 34111.0146433670. The cubic root of 1163561320 is about 1051.7917465239.

The spelling of 1163561320 in words is "one billion, one hundred sixty-three million, five hundred sixty-one thousand, three hundred twenty".