8127991011 has 16 divisors (see below), whose sum is σ = 12457108224. Its totient is φ = 4617717024.

The previous prime is 8127990991. The next prime is 8127991043. The reversal of 8127991011 is 1101997218.

It is not a de Polignac number, because 8127991011 - 2¹⁵ = 8127958243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8127991511) 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 15 ways as a sum of consecutive naturals, for example, 1115001 + ... + 1122266.

It is an arithmetic number, because the mean of its divisors is an integer number (778569264).

Almost surely, 2^8127991011 is an apocalyptic number.

8127991011 is a deficient number, since it is larger than the sum of its proper divisors (4329117213).

8127991011 is a wasteful number, since it uses less digits than its factorization.

8127991011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237450.

The product of its (nonzero) digits is 9072, while the sum is 39.

The square root of 8127991011 is about 90155.3715038655. The cubic root of 8127991011 is about 2010.6095369270.

The spelling of 8127991011 in words is "eight billion, one hundred twenty-seven million, nine hundred ninety-one thousand, eleven".