1161863887 has 16 divisors (see below), whose sum is σ = 1190246400. Its totient is φ = 1133962560.

The previous prime is 1161863867. The next prime is 1161863891. The reversal of 1161863887 is 7883681611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161863887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161863887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161863867) 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, 2840539 + ... + 2840947.

It is an arithmetic number, because the mean of its divisors is an integer number (74390400).

Almost surely, 2^1161863887 is an apocalyptic number.

1161863887 is a deficient number, since it is larger than the sum of its proper divisors (28382513).

1161863887 is a wasteful number, since it uses less digits than its factorization.

1161863887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846.

The product of its digits is 387072, while the sum is 49.

The square root of 1161863887 is about 34086.1245523747. The cubic root of 1161863887 is about 1051.2800373821.

The spelling of 1161863887 in words is "one billion, one hundred sixty-one million, eight hundred sixty-three thousand, eight hundred eighty-seven".