1818778349 has 2 divisors, whose sum is σ = 1818778350. Its totient is φ = 1818778348.

The previous prime is 1818778271. The next prime is 1818778391. The reversal of 1818778349 is 9438778181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1658932900 + 159845449 = 40730^2 + 12643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818778349 - 2¹² = 1818774253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1818778294 and 1818778303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818798349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909389174 + 909389175.

It is an arithmetic number, because the mean of its divisors is an integer number (909389175).

Almost surely, 2^1818778349 is an apocalyptic number.

It is an amenable number.

1818778349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818778349 is an equidigital number, since it uses as much as digits as its factorization.

1818778349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 56.

The square root of 1818778349 is about 42647.1376413470. The cubic root of 1818778349 is about 1220.6559110712.

The spelling of 1818778349 in words is "one billion, eight hundred eighteen million, seven hundred seventy-eight thousand, three hundred forty-nine".