2161247819 has 2 divisors, whose sum is σ = 2161247820. Its totient is φ = 2161247818.

The previous prime is 2161247789. The next prime is 2161247827. The reversal of 2161247819 is 9187421612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161247819 is a prime.

It is a super-2 number, since 2×2161247819² = 9341984270264513522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2161247849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080623909 + 1080623910.

It is an arithmetic number, because the mean of its divisors is an integer number (1080623910).

Almost surely, 2^2161247819 is an apocalyptic number.

2161247819 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161247819 is an equidigital number, since it uses as much as digits as its factorization.

2161247819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 2161247819 is about 46489.2226112677. Note that the first 3 decimals coincide. The cubic root of 2161247819 is about 1292.9096868919.

The spelling of 2161247819 in words is "two billion, one hundred sixty-one million, two hundred forty-seven thousand, eight hundred nineteen".