161391852 has 96 divisors (see below), whose sum is σ = 446342400. Its totient is φ = 50913360.

The previous prime is 161391847. The next prime is 161391887. The reversal of 161391852 is 258193161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165727 + ... + 166697.

It is an arithmetic number, because the mean of its divisors is an integer number (4649400).

Almost surely, 2^161391852 is an apocalyptic number.

161391852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161391852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223171200).

161391852 is an abundant number, since it is smaller than the sum of its proper divisors (284950548).

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

161391852 is an equidigital number, since it uses as much as digits as its factorization.

161391852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 995 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 161391852 is about 12704.0092884097. The cubic root of 161391852 is about 544.4531754010.

The spelling of 161391852 in words is "one hundred sixty-one million, three hundred ninety-one thousand, eight hundred fifty-two".