1001020109 has 2 divisors, whose sum is σ = 1001020110. Its totient is φ = 1001020108.

The previous prime is 1001020093. The next prime is 1001020117. The reversal of 1001020109 is 9010201001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 936972100 + 64048009 = 30610^2 + 8003^2 .

It is an emirp because it is prime and its reverse (9010201001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001020109 - 2⁴ = 1001020093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001020093 and 1001020102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001020159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500510054 + 500510055.

It is an arithmetic number, because the mean of its divisors is an integer number (500510055).

Almost surely, 2^1001020109 is an apocalyptic number.

It is an amenable number.

1001020109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001020109 is an equidigital number, since it uses as much as digits as its factorization.

1001020109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1001020109 is about 31638.9018298676. The cubic root of 1001020109 is about 1000.3399207741.

The spelling of 1001020109 in words is "one billion, one million, twenty thousand, one hundred nine".