161536145 has 4 divisors (see below), whose sum is σ = 193843380. Its totient is φ = 129228912.

The previous prime is 161536139. The next prime is 161536163. The reversal of 161536145 is 541635161.

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 37503376 + 124032769 = 6124^2 + 11137^2 .

It is a cyclic number.

It is not a de Polignac number, because 161536145 - 2⁸ = 161535889 is a prime.

It is a super-2 number, since 2×161536145² = 52187852282922050, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 16153610 + ... + 16153619.

It is an arithmetic number, because the mean of its divisors is an integer number (48460845).

Almost surely, 2^161536145 is an apocalyptic number.

It is an amenable number.

161536145 is a deficient number, since it is larger than the sum of its proper divisors (32307235).

161536145 is an equidigital number, since it uses as much as digits as its factorization.

161536145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32307234.

The product of its digits is 10800, while the sum is 32.

The square root of 161536145 is about 12709.6870535824. The cubic root of 161536145 is about 544.6153838813.

The spelling of 161536145 in words is "one hundred sixty-one million, five hundred thirty-six thousand, one hundred forty-five".