1118099861 has 2 divisors, whose sum is σ = 1118099862. Its totient is φ = 1118099860.

The previous prime is 1118099813. The next prime is 1118099863. The reversal of 1118099861 is 1689908111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673143025 + 444956836 = 25945^2 + 21094^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118099861 - 2¹⁰ = 1118098837 is a prime.

Together with 1118099863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1118099863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559049930 + 559049931.

It is an arithmetic number, because the mean of its divisors is an integer number (559049931).

Almost surely, 2^1118099861 is an apocalyptic number.

It is an amenable number.

1118099861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118099861 is an equidigital number, since it uses as much as digits as its factorization.

1118099861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 44.

The square root of 1118099861 is about 33438.0002542018. Note that the first 3 decimals coincide. The cubic root of 1118099861 is about 1037.9111986159.

The spelling of 1118099861 in words is "one billion, one hundred eighteen million, ninety-nine thousand, eight hundred sixty-one".