8021890501 has 2 divisors, whose sum is σ = 8021890502. Its totient is φ = 8021890500.

The previous prime is 8021890451. The next prime is 8021890507. The reversal of 8021890501 is 1050981208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6722360100 + 1299530401 = 81990^2 + 36049^2 .

It is a cyclic number.

It is not a de Polignac number, because 8021890501 - 2¹¹ = 8021888453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8021890507) 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, 4010945250 + 4010945251.

It is an arithmetic number, because the mean of its divisors is an integer number (4010945251).

Almost surely, 2^8021890501 is an apocalyptic number.

It is an amenable number.

8021890501 is a deficient number, since it is larger than the sum of its proper divisors (1).

8021890501 is an equidigital number, since it uses as much as digits as its factorization.

8021890501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 8021890501 is about 89565.0071233180. The cubic root of 8021890501 is about 2001.8225470733.

The spelling of 8021890501 in words is "eight billion, twenty-one million, eight hundred ninety thousand, five hundred one".