1012001001 has 32 divisors (see below), whose sum is σ = 1510080000. Its totient is φ = 597542400.

The previous prime is 1012000999. The next prime is 1012001021. The reversal of 1012001001 is 1001002101.

It is not a de Polignac number, because 1012001001 - 2¹ = 1012000999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1012001021) 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, 809625 + ... + 810873.

It is an arithmetic number, because the mean of its divisors is an integer number (47190000).

Almost surely, 2^1012001001 is an apocalyptic number.

1012001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1012001001 is a deficient number, since it is larger than the sum of its proper divisors (498078999).

1012001001 is a wasteful number, since it uses less digits than its factorization.

1012001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877.

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

The square root of 1012001001 is about 31811.9631742525. The cubic root of 1012001001 is about 1003.9844368444.

Adding to 1012001001 its reverse (1001002101), we get a palindrome (2013003102).

It can be divided in two parts, 101200 and 1001, that added together give a palindrome (102201).

The spelling of 1012001001 in words is "one billion, twelve million, one thousand, one".