160821109 has 2 divisors, whose sum is σ = 160821110. Its totient is φ = 160821108.

The previous prime is 160821103. The next prime is 160821113. The reversal of 160821109 is 901128061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82410084 + 78411025 = 9078^2 + 8855^2 .

It is a cyclic number.

It is not a de Polignac number, because 160821109 - 2²⁵ = 127266677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160821103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80410554 + 80410555.

It is an arithmetic number, because the mean of its divisors is an integer number (80410555).

Almost surely, 2^160821109 is an apocalyptic number.

It is an amenable number.

160821109 is a deficient number, since it is larger than the sum of its proper divisors (1).

160821109 is an equidigital number, since it uses as much as digits as its factorization.

160821109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 160821109 is about 12681.5262882667. The cubic root of 160821109 is about 543.8106194979.

The spelling of 160821109 in words is "one hundred sixty million, eight hundred twenty-one thousand, one hundred nine".