7991020001 has 2 divisors, whose sum is σ = 7991020002. Its totient is φ = 7991020000.

The previous prime is 7991019997. The next prime is 7991020013. The reversal of 7991020001 is 1000201997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7752626401 + 238393600 = 88049^2 + 15440^2 .

It is a cyclic number.

It is not a de Polignac number, because 7991020001 - 2² = 7991019997 is a prime.

It is a super-3 number, since 3×7991020001³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7991020061) 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 as a sum of consecutive naturals, namely, 3995510000 + 3995510001.

It is an arithmetic number, because the mean of its divisors is an integer number (3995510001).

Almost surely, 2^7991020001 is an apocalyptic number.

It is an amenable number.

7991020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991020001 is an equidigital number, since it uses as much as digits as its factorization.

7991020001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 7991020001 is about 89392.5052842798. The cubic root of 7991020001 is about 1999.2513865739.

Adding to 7991020001 its reverse (1000201997), we get a palindrome (8991221998).

The spelling of 7991020001 in words is "seven billion, nine hundred ninety-one million, twenty thousand, one".