1118861 has 2 divisors, whose sum is σ = 1118862. Its totient is φ = 1118860.

The previous prime is 1118857. The next prime is 1118863. The reversal of 1118861 is 1688111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 469225 = 806^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118861 - 2² = 1118857 is a prime.

Together with 1118863, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1118861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1118863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559430 + 559431.

It is an arithmetic number, because the mean of its divisors is an integer number (559431).

2^1118861 is an apocalyptic number.

It is an amenable number.

1118861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118861 is an equidigital number, since it uses as much as digits as its factorization.

1118861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 26.

The square root of 1118861 is about 1057.7622606238. The cubic root of 1118861 is about 103.8146662229.

The spelling of 1118861 in words is "one million, one hundred eighteen thousand, eight hundred sixty-one".