1163681 has 4 divisors (see below), whose sum is σ = 1165872. Its totient is φ = 1161492.

The previous prime is 1163671. The next prime is 1163689. The reversal of 1163681 is 1863611.

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.

It is a cyclic number.

It is not a de Polignac number, because 1163681 - 2¹⁴ = 1147297 is a prime.

It is a super-2 number, since 2×1163681² = 2708306939522, which contains 22 as substring.

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 1163681.

It is not an unprimeable number, because it can be changed into a prime (1163689) 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, 266 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (291468).

2^1163681 is an apocalyptic number.

It is an amenable number.

1163681 is a deficient number, since it is larger than the sum of its proper divisors (2191).

1163681 is an equidigital number, since it uses as much as digits as its factorization.

1163681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190.

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

The square root of 1163681 is about 1078.7404692511. The cubic root of 1163681 is about 105.1827806540.

The spelling of 1163681 in words is "one million, one hundred sixty-three thousand, six hundred eighty-one".