2001131001 has 12 divisors (see below), whose sum is σ = 2997579312. Its totient is φ = 1334087172.

The previous prime is 2001130931. The next prime is 2001131023. The reversal of 2001131001 is 1001311002.

It is not a de Polignac number, because 2001131001 - 2¹⁷ = 2000999929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2001131101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4117311 + ... + 4117796.

It is an arithmetic number, because the mean of its divisors is an integer number (249798276).

Almost surely, 2^2001131001 is an apocalyptic number.

It is an amenable number.

2001131001 is a deficient number, since it is larger than the sum of its proper divisors (996448311).

2001131001 is an frugal number, since it uses more digits than its factorization.

2001131001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8235122 (or 8235110 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 2001131001 is about 44734.0027384092. The cubic root of 2001131001 is about 1260.1585004689.

Adding to 2001131001 its reverse (1001311002), we get a palindrome (3002442003).

The spelling of 2001131001 in words is "two billion, one million, one hundred thirty-one thousand, one".