8120590649 has 2 divisors, whose sum is σ = 8120590650. Its totient is φ = 8120590648.

The previous prime is 8120590631. The next prime is 8120590661. The reversal of 8120590649 is 9460950218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5228302249 + 2892288400 = 72307^2 + 53780^2 .

It is a cyclic number.

It is not a de Polignac number, because 8120590649 - 2¹² = 8120586553 is a prime.

It is not a weakly prime, because it can be changed into another prime (8120590669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060295324 + 4060295325.

It is an arithmetic number, because the mean of its divisors is an integer number (4060295325).

Almost surely, 2^8120590649 is an apocalyptic number.

It is an amenable number.

8120590649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8120590649 is an equidigital number, since it uses as much as digits as its factorization.

8120590649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 8120590649 is about 90114.3198886836. The cubic root of 8120590649 is about 2009.9991459779. Note that the first 3 decimals are identical.

The spelling of 8120590649 in words is "eight billion, one hundred twenty million, five hundred ninety thousand, six hundred forty-nine".