161609419 has 6 divisors (see below), whose sum is σ = 163922780. Its totient is φ = 159328260.

The previous prime is 161609353. The next prime is 161609443. The reversal of 161609419 is 914906161.

It is not a de Polignac number, because 161609419 - 2⁷ = 161609291 is a prime.

It is a super-2 number, since 2×161609419² = 52235208619035122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161609449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10989 + ... + 21070.

Almost surely, 2^161609419 is an apocalyptic number.

161609419 is a deficient number, since it is larger than the sum of its proper divisors (2313361).

161609419 is an frugal number, since it uses more digits than its factorization.

161609419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32201 (or 32130 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 161609419 is about 12712.5693311777. The cubic root of 161609419 is about 544.6977186332.

The spelling of 161609419 in words is "one hundred sixty-one million, six hundred nine thousand, four hundred nineteen".