161043641 has 16 divisors (see below), whose sum is σ = 182468160. Its totient is φ = 140790720.

The previous prime is 161043577. The next prime is 161043661. The reversal of 161043641 is 146340161.

161043641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161043641 - 2⁶ = 161043577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161043641.

It is not an unprimeable number, because it can be changed into a prime (161043661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92606 + ... + 94328.

It is an arithmetic number, because the mean of its divisors is an integer number (11404260).

Almost surely, 2^161043641 is an apocalyptic number.

161043641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161043641 is a deficient number, since it is larger than the sum of its proper divisors (21424519).

161043641 is a wasteful number, since it uses less digits than its factorization.

161043641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 161043641 is about 12690.2971202411. The cubic root of 161043641 is about 544.0613317979.

The spelling of 161043641 in words is "one hundred sixty-one million, forty-three thousand, six hundred forty-one".