161285203 has 4 divisors (see below), whose sum is σ = 161318808. Its totient is φ = 161251600.

The previous prime is 161285149. The next prime is 161285209. The reversal of 161285203 is 302582161.

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

It is a cyclic number.

It is not a de Polignac number, because 161285203 - 2⁹ = 161284691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161285209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8101 + ... + 19702.

It is an arithmetic number, because the mean of its divisors is an integer number (40329702).

Almost surely, 2^161285203 is an apocalyptic number.

161285203 is a deficient number, since it is larger than the sum of its proper divisors (33605).

161285203 is an equidigital number, since it uses as much as digits as its factorization.

161285203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33604.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 161285203 is about 12699.8111403280. The cubic root of 161285203 is about 544.3332226676. Note that the first 3 decimals are identical.

The spelling of 161285203 in words is "one hundred sixty-one million, two hundred eighty-five thousand, two hundred three".