1628091109 has 2 divisors, whose sum is σ = 1628091110. Its totient is φ = 1628091108.

The previous prime is 1628091103. The next prime is 1628091163. The reversal of 1628091109 is 9011908261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 970322500 + 657768609 = 31150^2 + 25647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1628091109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1628091103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814045554 + 814045555.

It is an arithmetic number, because the mean of its divisors is an integer number (814045555).

Almost surely, 2^1628091109 is an apocalyptic number.

It is an amenable number.

1628091109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628091109 is an equidigital number, since it uses as much as digits as its factorization.

1628091109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 1628091109 is about 40349.6110142341. The cubic root of 1628091109 is about 1176.4123313563.

The spelling of 1628091109 in words is "one billion, six hundred twenty-eight million, ninety-one thousand, one hundred nine".