1821323269 has 2 divisors, whose sum is σ = 1821323270. Its totient is φ = 1821323268.

The previous prime is 1821323267. The next prime is 1821323359. The reversal of 1821323269 is 9623231281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1500555169 + 320768100 = 38737^2 + 17910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821323269 - 2¹ = 1821323267 is a prime.

It is a super-2 number, since 2×1821323269² = 6634436900401692722, which contains 22 as substring.

Together with 1821323267, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1821323267) 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, 910661634 + 910661635.

It is an arithmetic number, because the mean of its divisors is an integer number (910661635).

Almost surely, 2^1821323269 is an apocalyptic number.

It is an amenable number.

1821323269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821323269 is an equidigital number, since it uses as much as digits as its factorization.

1821323269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 1821323269 is about 42676.9641492925. The cubic root of 1821323269 is about 1221.2249787389.

The spelling of 1821323269 in words is "one billion, eight hundred twenty-one million, three hundred twenty-three thousand, two hundred sixty-nine".