161609212 has 24 divisors (see below), whose sum is σ = 298244240. Its totient is φ = 76412160.

The previous prime is 161609209. The next prime is 161609233. The reversal of 161609212 is 212906161.

It is a super-2 number, since 2×161609212² = 52235074806521888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48628 + ... + 51844.

Almost surely, 2^161609212 is an apocalyptic number.

It is an amenable number.

161609212 is a deficient number, since it is larger than the sum of its proper divisors (136635028).

161609212 is a wasteful number, since it uses less digits than its factorization.

161609212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3901 (or 3899 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 161609212 is about 12712.5611896266. The cubic root of 161609212 is about 544.6974860715.

The spelling of 161609212 in words is "one hundred sixty-one million, six hundred nine thousand, two hundred twelve".