161209228 has 24 divisors (see below), whose sum is σ = 285630464. Its totient is φ = 79606800.

The previous prime is 161209219. The next prime is 161209241. The reversal of 161209228 is 822902161.

It is a self number, because there is not a number n which added to its sum of digits gives 161209228.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137083 + ... + 138253.

Almost surely, 2^161209228 is an apocalyptic number.

It is an amenable number.

161209228 is a deficient number, since it is larger than the sum of its proper divisors (124421236).

161209228 is a wasteful number, since it uses less digits than its factorization.

161209228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 161209228 is about 12696.8196017743. The cubic root of 161209228 is about 544.2477380494.

The spelling of 161209228 in words is "one hundred sixty-one million, two hundred nine thousand, two hundred twenty-eight".