1002011001 has 32 divisors (see below), whose sum is σ = 1398767616. Its totient is φ = 637560000.

The previous prime is 1002010981. The next prime is 1002011011. The reversal of 1002011001 is 1001102001.

It is not a de Polignac number, because 1002011001 - 2¹⁸ = 1001748857 is a prime.

It is a super-2 number, since 2×1002011001² = 2008052092250044002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1002011011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1010616 + ... + 1011606.

It is an arithmetic number, because the mean of its divisors is an integer number (43711488).

Almost surely, 2^1002011001 is an apocalyptic number.

It is an amenable number.

1002011001 is a deficient number, since it is larger than the sum of its proper divisors (396756615).

1002011001 is a wasteful number, since it uses less digits than its factorization.

1002011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1002011001 is about 31654.5573496140. The cubic root of 1002011001 is about 1000.6698848208.

Adding to 1002011001 its reverse (1001102001), we get a palindrome (2003113002).

The spelling of 1002011001 in words is "one billion, two million, eleven thousand, one".