1949219917 has 2 divisors, whose sum is σ = 1949219918. Its totient is φ = 1949219916.

The previous prime is 1949219897. The next prime is 1949219927. The reversal of 1949219917 is 7199129491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1046457801 + 902762116 = 32349^2 + 30046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949219917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949219927) 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, 974609958 + 974609959.

It is an arithmetic number, because the mean of its divisors is an integer number (974609959).

Almost surely, 2^1949219917 is an apocalyptic number.

It is an amenable number.

1949219917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949219917 is an equidigital number, since it uses as much as digits as its factorization.

1949219917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 52.

The square root of 1949219917 is about 44149.9707474422. The cubic root of 1949219917 is about 1249.1663597855.

The spelling of 1949219917 in words is "one billion, nine hundred forty-nine million, two hundred nineteen thousand, nine hundred seventeen".