161000019 has 24 divisors (see below), whose sum is σ = 240893952. Its totient is φ = 103509360.

The previous prime is 161000017. The next prime is 161000057. The reversal of 161000019 is 910000161.

It is not a de Polignac number, because 161000019 - 2¹ = 161000017 is a prime.

It is a super-2 number, since 2×161000019² = 51842012236000722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 160999965 and 161000010.

It is not an unprimeable number, because it can be changed into a prime (161000017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95982 + ... + 97644.

It is an arithmetic number, because the mean of its divisors is an integer number (10037248).

Almost surely, 2^161000019 is an apocalyptic number.

161000019 is a deficient number, since it is larger than the sum of its proper divisors (79893933).

161000019 is a wasteful number, since it uses less digits than its factorization.

161000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047 (or 2044 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 161000019 is about 12688.5782891544. The cubic root of 161000019 is about 544.0122039415.

The spelling of 161000019 in words is "one hundred sixty-one million, nineteen", and thus it is an aban number.