161071040 has 112 divisors (see below), whose sum is σ = 426720000. Its totient is φ = 57507840.

The previous prime is 161071019. The next prime is 161071051. The reversal of 161071040 is 40170161.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128336 + ... + 129584.

It is an arithmetic number, because the mean of its divisors is an integer number (3810000).

Almost surely, 2^161071040 is an apocalyptic number.

161071040 is a gapful number since it is divisible by the number (10) 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 161071040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213360000).

161071040 is an abundant number, since it is smaller than the sum of its proper divisors (265648960).

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

161071040 is a wasteful number, since it uses less digits than its factorization.

161071040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 161071040 is about 12691.3765998807. The cubic root of 161071040 is about 544.0921844932.

The spelling of 161071040 in words is "one hundred sixty-one million, seventy-one thousand, forty".