819487349 has 2 divisors, whose sum is σ = 819487350. Its totient is φ = 819487348.

The previous prime is 819487343. The next prime is 819487351. The reversal of 819487349 is 943784918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 818818225 + 669124 = 28615^2 + 818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819487349 is a prime.

It is a Sophie Germain prime.

Together with 819487351, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 819487349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819487343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409743674 + 409743675.

It is an arithmetic number, because the mean of its divisors is an integer number (409743675).

Almost surely, 2^819487349 is an apocalyptic number.

It is an amenable number.

819487349 is a deficient number, since it is larger than the sum of its proper divisors (1).

819487349 is an equidigital number, since it uses as much as digits as its factorization.

819487349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 819487349 is about 28626.6894523275. The cubic root of 819487349 is about 935.7950662479.

The spelling of 819487349 in words is "eight hundred nineteen million, four hundred eighty-seven thousand, three hundred forty-nine".