1001385909 has 20 divisors (see below), whose sum is σ = 1514842560. Its totient is φ = 659135880.

The previous prime is 1001385907. The next prime is 1001385911. The reversal of 1001385909 is 9095831001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1001385907) and next prime (1001385911).

It is not a de Polignac number, because 1001385909 - 2¹ = 1001385907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001385907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 71847 + ... + 84644.

It is an arithmetic number, because the mean of its divisors is an integer number (75742128).

Almost surely, 2^1001385909 is an apocalyptic number.

It is an amenable number.

1001385909 is a deficient number, since it is larger than the sum of its proper divisors (513456651).

1001385909 is an equidigital number, since it uses as much as digits as its factorization.

1001385909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156582 (or 156573 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1001385909 is about 31644.6821598827. The cubic root of 1001385909 is about 1000.4617564149.

The spelling of 1001385909 in words is "one billion, one million, three hundred eighty-five thousand, nine hundred nine".