161940285 has 24 divisors (see below), whose sum is σ = 302289624. Its totient is φ = 79724160.

The previous prime is 161940277. The next prime is 161940293. The reversal of 161940285 is 582049161.

161940285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161940277) and next prime (161940293).

It can be written as a sum of positive squares in 4 ways, for example, as 675684 + 161264601 = 822^2 + 12699^2 .

It is not a de Polignac number, because 161940285 - 2³ = 161940277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137826 + ... + 138995.

It is an arithmetic number, because the mean of its divisors is an integer number (12595401).

Almost surely, 2^161940285 is an apocalyptic number.

161940285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161940285 is a deficient number, since it is larger than the sum of its proper divisors (140349339).

161940285 is a wasteful number, since it uses less digits than its factorization.

161940285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276845 (or 276842 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 161940285 is about 12725.5760183970. The cubic root of 161940285 is about 545.0691885339.

The spelling of 161940285 in words is "one hundred sixty-one million, nine hundred forty thousand, two hundred eighty-five".