7991022001 has 4 divisors (see below), whose sum is σ = 7991215092. Its totient is φ = 7990828912.

The previous prime is 7991021933. The next prime is 7991022019. The reversal of 7991022001 is 1002201997.

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 3621150976 + 4369871025 = 60176^2 + 66105^2 .

It is a cyclic number.

It is not a de Polignac number, because 7991022001 - 2²⁷ = 7856804273 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7991022701) 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, 6430 + ... + 126583.

It is an arithmetic number, because the mean of its divisors is an integer number (1997803773).

Almost surely, 2^7991022001 is an apocalyptic number.

It is an amenable number.

7991022001 is a deficient number, since it is larger than the sum of its proper divisors (193091).

7991022001 is a wasteful number, since it uses less digits than its factorization.

7991022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193090.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 7991022001 is about 89392.5164708993. The cubic root of 7991022001 is about 1999.2515533654.

Adding to 7991022001 its reverse (1002201997), we get a palindrome (8993223998).

The spelling of 7991022001 in words is "seven billion, nine hundred ninety-one million, twenty-two thousand, one".