1163861 has 4 divisors (see below), whose sum is σ = 1188672. Its totient is φ = 1139052.

The previous prime is 1163849. The next prime is 1163873. The reversal of 1163861 is 1683611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1683611 = 37 ⋅45503.

It is an interprime number because it is at equal distance from previous prime (1163849) and next prime (1163873).

It is a cyclic number.

It is not a de Polignac number, because 1163861 - 2¹⁸ = 901717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1163861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12335 + ... + 12428.

It is an arithmetic number, because the mean of its divisors is an integer number (297168).

2^1163861 is an apocalyptic number.

It is an amenable number.

1163861 is a deficient number, since it is larger than the sum of its proper divisors (24811).

1163861 is an equidigital number, since it uses as much as digits as its factorization.

1163861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24810.

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

The square root of 1163861 is about 1078.8238966578. The cubic root of 1163861 is about 105.1882036535.

The spelling of 1163861 in words is "one million, one hundred sixty-three thousand, eight hundred sixty-one".