1949218811 has 2 divisors, whose sum is σ = 1949218812. Its totient is φ = 1949218810.

The previous prime is 1949218801. The next prime is 1949218879. The reversal of 1949218811 is 1188129491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949218811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1949218801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974609405 + 974609406.

It is an arithmetic number, because the mean of its divisors is an integer number (974609406).

Almost surely, 2^1949218811 is an apocalyptic number.

1949218811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949218811 is an equidigital number, since it uses as much as digits as its factorization.

1949218811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 44.

The square root of 1949218811 is about 44149.9582219508. The cubic root of 1949218811 is about 1249.1661235237.

The spelling of 1949218811 in words is "one billion, nine hundred forty-nine million, two hundred eighteen thousand, eight hundred eleven".