161323985 has 4 divisors (see below), whose sum is σ = 193588788. Its totient is φ = 129059184.

The previous prime is 161323979. The next prime is 161323991. The reversal of 161323985 is 589323161.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (161323979) and next prime (161323991).

It can be written as a sum of positive squares in 2 ways, for example, as 35188624 + 126135361 = 5932^2 + 11231^2 .

It is a cyclic number.

It is not a de Polignac number, because 161323985 - 2²² = 157129681 is a prime.

It is a Duffinian number.

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, 16132394 + ... + 16132403.

It is an arithmetic number, because the mean of its divisors is an integer number (48397197).

Almost surely, 2^161323985 is an apocalyptic number.

It is an amenable number.

161323985 is a deficient number, since it is larger than the sum of its proper divisors (32264803).

161323985 is an equidigital number, since it uses as much as digits as its factorization.

161323985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32264802.

The product of its digits is 38880, while the sum is 38.

The square root of 161323985 is about 12701.3379216522. The cubic root of 161323985 is about 544.3768485734.

The spelling of 161323985 in words is "one hundred sixty-one million, three hundred twenty-three thousand, nine hundred eighty-five".