1818212111 has 2 divisors, whose sum is σ = 1818212112. Its totient is φ = 1818212110.

The previous prime is 1818212089. The next prime is 1818212113. The reversal of 1818212111 is 1112128181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1818212111 - 2¹⁸ = 1817949967 is a prime.

Together with 1818212113, 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 (1818212113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909106055 + 909106056.

It is an arithmetic number, because the mean of its divisors is an integer number (909106056).

Almost surely, 2^1818212111 is an apocalyptic number.

1818212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818212111 is an equidigital number, since it uses as much as digits as its factorization.

1818212111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 26.

The square root of 1818212111 is about 42640.4984844221. The cubic root of 1818212111 is about 1220.5292228278.

The spelling of 1818212111 in words is "one billion, eight hundred eighteen million, two hundred twelve thousand, one hundred eleven".