2161861619 has 2 divisors, whose sum is σ = 2161861620. Its totient is φ = 2161861618.

The previous prime is 2161861589. The next prime is 2161861631. The reversal of 2161861619 is 9161681612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161861619 is a prime.

It is a super-2 number, since 2×2161861619² = 9347291319410602322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2161861699) 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, 1080930809 + 1080930810.

It is an arithmetic number, because the mean of its divisors is an integer number (1080930810).

Almost surely, 2^2161861619 is an apocalyptic number.

2161861619 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161861619 is an equidigital number, since it uses as much as digits as its factorization.

2161861619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 2161861619 is about 46495.8236726698. The cubic root of 2161861619 is about 1293.0320718777.

The spelling of 2161861619 in words is "two billion, one hundred sixty-one million, eight hundred sixty-one thousand, six hundred nineteen".