161684203 has 2 divisors, whose sum is σ = 161684204. Its totient is φ = 161684202.

The previous prime is 161684179. The next prime is 161684209. The reversal of 161684203 is 302486161.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (302486161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161684203 is a prime.

It is a super-2 number, since 2×161684203² = 52283562999490418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161684209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80842101 + 80842102.

It is an arithmetic number, because the mean of its divisors is an integer number (80842102).

Almost surely, 2^161684203 is an apocalyptic number.

161684203 is a deficient number, since it is larger than the sum of its proper divisors (1).

161684203 is an equidigital number, since it uses as much as digits as its factorization.

161684203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 161684203 is about 12715.5103318742. The cubic root of 161684203 is about 544.7817244476.

The spelling of 161684203 in words is "one hundred sixty-one million, six hundred eighty-four thousand, two hundred three".