4001191001 has 4 divisors (see below), whose sum is σ = 4026676452. Its totient is φ = 3975705552.

The previous prime is 4001190997. The next prime is 4001191027. The reversal of 4001191001 is 1001911004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2043040000 + 1958151001 = 45200^2 + 44251^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001191001 - 2² = 4001190997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001191091) 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 3 ways as a sum of consecutive naturals, for example, 12742490 + ... + 12742803.

It is an arithmetic number, because the mean of its divisors is an integer number (1006669113).

Almost surely, 2^4001191001 is an apocalyptic number.

It is an amenable number.

4001191001 is a deficient number, since it is larger than the sum of its proper divisors (25485451).

4001191001 is a wasteful number, since it uses less digits than its factorization.

4001191001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25485450.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 4001191001 is about 63254.9681922298. The cubic root of 4001191001 is about 1587.5585860207.

The spelling of 4001191001 in words is "four billion, one million, one hundred ninety-one thousand, one".