1001613891 has 4 divisors (see below), whose sum is σ = 1335485192. Its totient is φ = 667742592.

The previous prime is 1001613889. The next prime is 1001613917. The reversal of 1001613891 is 1983161001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1983161001 = 3 ⋅661053667.

It is not a de Polignac number, because 1001613891 - 2¹ = 1001613889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001613881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166935646 + ... + 166935651.

It is an arithmetic number, because the mean of its divisors is an integer number (333871298).

Almost surely, 2^1001613891 is an apocalyptic number.

1001613891 is a deficient number, since it is larger than the sum of its proper divisors (333871301).

1001613891 is an equidigital number, since it uses as much as digits as its factorization.

1001613891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333871300.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1001613891 is about 31648.2841714997. The cubic root of 1001613891 is about 1000.5376745210.

Adding to 1001613891 its reverse (1983161001), we get a palindrome (2984774892).

The spelling of 1001613891 in words is "one billion, one million, six hundred thirteen thousand, eight hundred ninety-one".