161211928 has 16 divisors (see below), whose sum is σ = 312696000. Its totient is φ = 77826336.

The previous prime is 161211907. The next prime is 161211931. The reversal of 161211928 is 829112161.

It is a happy number.

161211928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161211928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347208 + ... + 347671.

It is an arithmetic number, because the mean of its divisors is an integer number (19543500).

Almost surely, 2^161211928 is an apocalyptic number.

It is an amenable number.

161211928 is a deficient number, since it is larger than the sum of its proper divisors (151484072).

161211928 is a wasteful number, since it uses less digits than its factorization.

161211928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694914 (or 694910 counting only the distinct ones).

The product of its digits is 1728, while the sum is 31.

The square root of 161211928 is about 12696.9259271684. The cubic root of 161211928 is about 544.2507764625.

The spelling of 161211928 in words is "one hundred sixty-one million, two hundred eleven thousand, nine hundred twenty-eight".