161443601 has 8 divisors (see below), whose sum is σ = 183777984. Its totient is φ = 140385520.

The previous prime is 161443591. The next prime is 161443621. The reversal of 161443601 is 106344161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161443601 - 2⁶ = 161443537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161443621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318806 + ... + 319311.

It is an arithmetic number, because the mean of its divisors is an integer number (22972248).

Almost surely, 2^161443601 is an apocalyptic number.

161443601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161443601 is a deficient number, since it is larger than the sum of its proper divisors (22334383).

161443601 is a wasteful number, since it uses less digits than its factorization.

161443601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638151.

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

The square root of 161443601 is about 12706.0458444002. The cubic root of 161443601 is about 544.5113606940.

Adding to 161443601 its reverse (106344161), we get a palindrome (267787762).

The spelling of 161443601 in words is "one hundred sixty-one million, four hundred forty-three thousand, six hundred one".