1020801109 has 2 divisors, whose sum is σ = 1020801110. Its totient is φ = 1020801108.

The previous prime is 1020801071. The next prime is 1020801137. The reversal of 1020801109 is 9011080201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 882268209 + 138532900 = 29703^2 + 11770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020801109 - 2⁹ = 1020800597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020801109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020801169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510400554 + 510400555.

It is an arithmetic number, because the mean of its divisors is an integer number (510400555).

Almost surely, 2^1020801109 is an apocalyptic number.

It is an amenable number.

1020801109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020801109 is an equidigital number, since it uses as much as digits as its factorization.

1020801109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1020801109 is about 31949.9782316045. The cubic root of 1020801109 is about 1006.8861747512.

The spelling of 1020801109 in words is "one billion, twenty million, eight hundred one thousand, one hundred nine".