1161863 has 4 divisors (see below), whose sum is σ = 1164360. Its totient is φ = 1159368.

The previous prime is 1161857. The next prime is 1161871. The reversal of 1161863 is 3681611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1161863 - 2¹⁰ = 1160839 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 (1161833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320 + ... + 1557.

It is an arithmetic number, because the mean of its divisors is an integer number (291090).

2^1161863 is an apocalyptic number.

1161863 is a deficient number, since it is larger than the sum of its proper divisors (2497).

1161863 is an equidigital number, since it uses as much as digits as its factorization.

1161863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496.

The product of its digits is 864, while the sum is 26.

The square root of 1161863 is about 1077.8974904878. The cubic root of 1161863 is about 105.1279769856.

The spelling of 1161863 in words is "one million, one hundred sixty-one thousand, eight hundred sixty-three".