8503939921 has 2 divisors, whose sum is σ = 8503939922. Its totient is φ = 8503939920.

The previous prime is 8503939919. The next prime is 8503939931. The reversal of 8503939921 is 1299393058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7615005696 + 888934225 = 87264^2 + 29815^2 .

It is a cyclic number.

It is not a de Polignac number, because 8503939921 - 2¹ = 8503939919 is a prime.

Together with 8503939919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8503939901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4251969960 + 4251969961.

It is an arithmetic number, because the mean of its divisors is an integer number (4251969961).

Almost surely, 2^8503939921 is an apocalyptic number.

It is an amenable number.

8503939921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8503939921 is an equidigital number, since it uses as much as digits as its factorization.

8503939921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 8503939921 is about 92216.8093191258. The cubic root of 8503939921 is about 2041.1428237941.

The spelling of 8503939921 in words is "eight billion, five hundred three million, nine hundred thirty-nine thousand, nine hundred twenty-one".