1001121009 has 36 divisors (see below), whose sum is σ = 1587014064. Its totient is φ = 559715856.

The previous prime is 1001120999. The next prime is 1001121031. The reversal of 1001121009 is 9001211001.

It is not a de Polignac number, because 1001121009 - 2⁷ = 1001120881 is a prime.

It is a super-2 number, since 2×1001121009² = 2004486549322356162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1001121059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 323182 + ... + 326264.

It is an arithmetic number, because the mean of its divisors is an integer number (44083724).

Almost surely, 2^1001121009 is an apocalyptic number.

It is an amenable number.

1001121009 is a deficient number, since it is larger than the sum of its proper divisors (585893055).

1001121009 is an equidigital number, since it uses as much as digits as its factorization.

1001121009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194 (or 3140 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 1001121009 is about 31640.4963456644. The cubic root of 1001121009 is about 1000.3735301245.

The spelling of 1001121009 in words is "one billion, one million, one hundred twenty-one thousand, nine".