8076621991 has 4 divisors (see below), whose sum is σ = 8078311872. Its totient is φ = 8074932112.

The previous prime is 8076621899. The next prime is 8076622007. The reversal of 8076621991 is 1991266708.

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

It is a cyclic number.

It is not a de Polignac number, because 8076621991 - 2¹⁹ = 8076097703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8076622991) 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, 837751 + ... + 847336.

It is an arithmetic number, because the mean of its divisors is an integer number (2019577968).

Almost surely, 2^8076621991 is an apocalyptic number.

8076621991 is a deficient number, since it is larger than the sum of its proper divisors (1689881).

8076621991 is a wasteful number, since it uses less digits than its factorization.

8076621991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689880.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 8076621991 is about 89870.0283242417. The cubic root of 8076621991 is about 2006.3648885259.

The spelling of 8076621991 in words is "eight billion, seventy-six million, six hundred twenty-one thousand, nine hundred ninety-one".