8450821913 has 2 divisors, whose sum is σ = 8450821914. Its totient is φ = 8450821912.

The previous prime is 8450821909. The next prime is 8450821999. The reversal of 8450821913 is 3191280548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6017570329 + 2433251584 = 77573^2 + 49328^2 .

It is a cyclic number.

It is not a de Polignac number, because 8450821913 - 2² = 8450821909 is a prime.

It is not a weakly prime, because it can be changed into another prime (8450820913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4225410956 + 4225410957.

It is an arithmetic number, because the mean of its divisors is an integer number (4225410957).

Almost surely, 2^8450821913 is an apocalyptic number.

It is an amenable number.

8450821913 is a deficient number, since it is larger than the sum of its proper divisors (1).

8450821913 is an equidigital number, since it uses as much as digits as its factorization.

8450821913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 8450821913 is about 91928.3520628973. The cubic root of 8450821913 is about 2036.8840930516.

The spelling of 8450821913 in words is "eight billion, four hundred fifty million, eight hundred twenty-one thousand, nine hundred thirteen".