8511793921 has 2 divisors, whose sum is σ = 8511793922. Its totient is φ = 8511793920.

The previous prime is 8511793897. The next prime is 8511793943. The reversal of 8511793921 is 1293971158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5146053696 + 3365740225 = 71736^2 + 58015^2 .

It is a cyclic number.

It is not a de Polignac number, because 8511793921 - 2¹³ = 8511785729 is a prime.

It is not a weakly prime, because it can be changed into another prime (8511793951) 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 as a sum of consecutive naturals, namely, 4255896960 + 4255896961.

It is an arithmetic number, because the mean of its divisors is an integer number (4255896961).

Almost surely, 2^8511793921 is an apocalyptic number.

It is an amenable number.

8511793921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8511793921 is an equidigital number, since it uses as much as digits as its factorization.

8511793921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 8511793921 is about 92259.3839183852. The cubic root of 8511793921 is about 2041.7710111643.

The spelling of 8511793921 in words is "eight billion, five hundred eleven million, seven hundred ninety-three thousand, nine hundred twenty-one".