161920452 has 24 divisors (see below), whose sum is σ = 385854336. Its totient is φ = 52824928.

The previous prime is 161920417. The next prime is 161920469. The reversal of 161920452 is 254029161.

161920452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 142983 + ... + 144110.

It is an arithmetic number, because the mean of its divisors is an integer number (16077264).

Almost surely, 2^161920452 is an apocalyptic number.

161920452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161920452 is an abundant number, since it is smaller than the sum of its proper divisors (223933884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161920452 is a wasteful number, since it uses less digits than its factorization.

161920452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287147 (or 287145 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161920452 is about 12724.7967370799. The cubic root of 161920452 is about 545.0469358898.

The spelling of 161920452 in words is "one hundred sixty-one million, nine hundred twenty thousand, four hundred fifty-two".