1812269 has 2 divisors, whose sum is σ = 1812270. Its totient is φ = 1812268.

The previous prime is 1812263. The next prime is 1812271. The reversal of 1812269 is 9622181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 56644 = 1325^2 + 238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1812269 is a prime.

It is a super-2 number, since 2×1812269² = 6568637856722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1812271, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p₁₃₅₉₂₉ and since 1812269 and 135929 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906134 + 906135.

It is an arithmetic number, because the mean of its divisors is an integer number (906135).

2^1812269 is an apocalyptic number.

It is an amenable number.

1812269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812269 is an equidigital number, since it uses as much as digits as its factorization.

1812269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 1812269 is about 1346.2054078037. The cubic root of 1812269 is about 121.9197940975.

The spelling of 1812269 in words is "one million, eight hundred twelve thousand, two hundred sixty-nine".