161005619 has 2 divisors, whose sum is σ = 161005620. Its totient is φ = 161005618.

The previous prime is 161005613. The next prime is 161005627. The reversal of 161005619 is 916500161.

It is a weak prime.

It is an emirp because it is prime and its reverse (916500161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161005619 - 2¹² = 161001523 is a prime.

It is a super-2 number, since 2×161005619² = 51845618699146322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161005591 and 161005600.

It is not a weakly prime, because it can be changed into another prime (161005613) 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, 80502809 + 80502810.

It is an arithmetic number, because the mean of its divisors is an integer number (80502810).

Almost surely, 2^161005619 is an apocalyptic number.

161005619 is a deficient number, since it is larger than the sum of its proper divisors (1).

161005619 is an equidigital number, since it uses as much as digits as its factorization.

161005619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 161005619 is about 12688.7989581363. The cubic root of 161005619 is about 544.0185112555.

The spelling of 161005619 in words is "one hundred sixty-one million, five thousand, six hundred nineteen".