1001881001 has 16 divisors (see below), whose sum is σ = 1151539200. Its totient is φ = 862074000.

The previous prime is 1001880991. The next prime is 1001881051.

1001881001 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001881001 is a prime.

1001881001 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1001881051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424976 + ... + 427326.

It is an arithmetic number, because the mean of its divisors is an integer number (71971200).

Almost surely, 2^1001881001 is an apocalyptic number.

1001881001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001881001 is a deficient number, since it is larger than the sum of its proper divisors (149658199).

1001881001 is a wasteful number, since it uses less digits than its factorization.

1001881001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 1001881001 is about 31652.5038662031. The cubic root of 1001881001 is about 1000.6266076142.

It can be divided in two parts, 10018 and 81001, that added together give a palindrome (91019).

The spelling of 1001881001 in words is "one billion, one million, eight hundred eighty-one thousand, one".