160551721 has 8 divisors (see below), whose sum is σ = 176882688. Its totient is φ = 144510000.

The previous prime is 160551719. The next prime is 160551731. The reversal of 160551721 is 127155061.

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

It is a cyclic number.

It is not a de Polignac number, because 160551721 - 2¹ = 160551719 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 160551721.

It is not an unprimeable number, because it can be changed into a prime (160551731) 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 7 ways as a sum of consecutive naturals, for example, 71145 + ... + 73366.

It is an arithmetic number, because the mean of its divisors is an integer number (22110336).

Almost surely, 2^160551721 is an apocalyptic number.

160551721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

160551721 is a deficient number, since it is larger than the sum of its proper divisors (16330967).

160551721 is a wasteful number, since it uses less digits than its factorization.

160551721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144623.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 160551721 is about 12670.9005599444. The cubic root of 160551721 is about 543.5068079527.

The spelling of 160551721 in words is "one hundred sixty million, five hundred fifty-one thousand, seven hundred twenty-one".