1811000117 has 2 divisors, whose sum is σ = 1811000118. Its totient is φ = 1811000116.

The previous prime is 1811000077. The next prime is 1811000119. The reversal of 1811000117 is 7110001181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1733806321 + 77193796 = 41639^2 + 8786^2 .

It is an emirp because it is prime and its reverse (7110001181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1811000117 - 2¹² = 1810996021 is a prime.

Together with 1811000119, 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 (1811000119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905500058 + 905500059.

It is an arithmetic number, because the mean of its divisors is an integer number (905500059).

Almost surely, 2^1811000117 is an apocalyptic number.

It is an amenable number.

1811000117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811000117 is an equidigital number, since it uses as much as digits as its factorization.

1811000117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 20.

The square root of 1811000117 is about 42555.8470365707. The cubic root of 1811000117 is about 1218.9133289343.

Adding to 1811000117 its reverse (7110001181), we get a palindrome (8921001298).

It can be divided in two parts, 1 and 811000117, that added together give a palindrome (811000118).

The spelling of 1811000117 in words is "one billion, eight hundred eleven million, one hundred seventeen", and thus it is an aban number.