1809628349 has 2 divisors, whose sum is σ = 1809628350. Its totient is φ = 1809628348.

The previous prime is 1809628313. The next prime is 1809628361. The reversal of 1809628349 is 9438269081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1535229124 + 274399225 = 39182^2 + 16565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1809628349 - 2¹² = 1809624253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1809628297 and 1809628306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1809628309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904814174 + 904814175.

It is an arithmetic number, because the mean of its divisors is an integer number (904814175).

Almost surely, 2^1809628349 is an apocalyptic number.

It is an amenable number.

1809628349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809628349 is an equidigital number, since it uses as much as digits as its factorization.

1809628349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 1809628349 is about 42539.7267151542. The cubic root of 1809628349 is about 1218.6054900707.

The spelling of 1809628349 in words is "one billion, eight hundred nine million, six hundred twenty-eight thousand, three hundred forty-nine".