161222872 has 16 divisors (see below), whose sum is σ = 302572800. Its totient is φ = 80536800.

The previous prime is 161222843. The next prime is 161222911. The reversal of 161222872 is 278222161.

It is a happy number.

161222872 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454 + ... + 17962.

It is an arithmetic number, because the mean of its divisors is an integer number (18910800).

Almost surely, 2^161222872 is an apocalyptic number.

It is an amenable number.

161222872 is a deficient number, since it is larger than the sum of its proper divisors (141349928).

161222872 is a wasteful number, since it uses less digits than its factorization.

161222872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18666 (or 18662 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 161222872 is about 12697.3568903138. The cubic root of 161222872 is about 544.2630918162.

The spelling of 161222872 in words is "one hundred sixty-one million, two hundred twenty-two thousand, eight hundred seventy-two".