161853312 has 32 divisors (see below), whose sum is σ = 429923880. Its totient is φ = 53950976.

The previous prime is 161853301. The next prime is 161853319. The reversal of 161853312 is 213358161.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 161853312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161853319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210363 + ... + 211130.

Almost surely, 2^161853312 is an apocalyptic number.

161853312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161853312 is an abundant number, since it is smaller than the sum of its proper divisors (268070568).

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

161853312 is an equidigital number, since it uses as much as digits as its factorization.

161853312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421510 (or 421498 counting only the distinct ones).

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

The square root of 161853312 is about 12722.1583074571. The cubic root of 161853312 is about 544.9715912583.

It can be divided in two parts, 161853 and 312, that added together give a triangular number (162165 = T₅₆₉).

The spelling of 161853312 in words is "one hundred sixty-one million, eight hundred fifty-three thousand, three hundred twelve".