161684227 has 4 divisors (see below), whose sum is σ = 168714000. Its totient is φ = 154654456.

The previous prime is 161684213. The next prime is 161684231. The reversal of 161684227 is 722486161.

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 161684227 - 2¹¹ = 161682179 is a prime.

It is a super-2 number, since 2×161684227² = 52283578521175058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161684527) 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, 3514852 + ... + 3514897.

It is an arithmetic number, because the mean of its divisors is an integer number (42178500).

Almost surely, 2^161684227 is an apocalyptic number.

161684227 is a deficient number, since it is larger than the sum of its proper divisors (7029773).

161684227 is an equidigital number, since it uses as much as digits as its factorization.

161684227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7029772.

The product of its digits is 32256, while the sum is 37.

The square root of 161684227 is about 12715.5112756035. The cubic root of 161684227 is about 544.7817514029.

The spelling of 161684227 in words is "one hundred sixty-one million, six hundred eighty-four thousand, two hundred twenty-seven".