161584145 has 4 divisors (see below), whose sum is σ = 193900980. Its totient is φ = 129267312.

The previous prime is 161584139. The next prime is 161584169. The reversal of 161584145 is 541485161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38551681 + 123032464 = 6209^2 + 11092^2 .

It is a cyclic number.

It is not a de Polignac number, because 161584145 - 2¹² = 161580049 is a prime.

It is a super-2 number, since 2×161584145² = 52218871830762050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16158410 + ... + 16158419.

It is an arithmetic number, because the mean of its divisors is an integer number (48475245).

Almost surely, 2^161584145 is an apocalyptic number.

It is an amenable number.

161584145 is a deficient number, since it is larger than the sum of its proper divisors (32316835).

161584145 is an equidigital number, since it uses as much as digits as its factorization.

161584145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32316834.

The product of its digits is 19200, while the sum is 35.

The square root of 161584145 is about 12711.5752367675. The cubic root of 161584145 is about 544.6693221698.

The spelling of 161584145 in words is "one hundred sixty-one million, five hundred eighty-four thousand, one hundred forty-five".