160851221 has 2 divisors, whose sum is σ = 160851222. Its totient is φ = 160851220.

The previous prime is 160851199. The next prime is 160851233. The reversal of 160851221 is 122158061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90459121 + 70392100 = 9511^2 + 8390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160851221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160851721) 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 as a sum of consecutive naturals, namely, 80425610 + 80425611.

It is an arithmetic number, because the mean of its divisors is an integer number (80425611).

Almost surely, 2^160851221 is an apocalyptic number.

It is an amenable number.

160851221 is a deficient number, since it is larger than the sum of its proper divisors (1).

160851221 is an equidigital number, since it uses as much as digits as its factorization.

160851221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 160851221 is about 12682.7134714934. The cubic root of 160851221 is about 543.8445582504.

The spelling of 160851221 in words is "one hundred sixty million, eight hundred fifty-one thousand, two hundred twenty-one".