8242487921 has 2 divisors, whose sum is σ = 8242487922. Its totient is φ = 8242487920.

The previous prime is 8242487899. The next prime is 8242487941. The reversal of 8242487921 is 1297842428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7737137521 + 505350400 = 87961^2 + 22480^2 .

It is a cyclic number.

It is not a de Polignac number, because 8242487921 - 2²⁶ = 8175379057 is a prime.

It is not a weakly prime, because it can be changed into another prime (8242487941) 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, 4121243960 + 4121243961.

It is an arithmetic number, because the mean of its divisors is an integer number (4121243961).

Almost surely, 2^8242487921 is an apocalyptic number.

It is an amenable number.

8242487921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8242487921 is an equidigital number, since it uses as much as digits as its factorization.

8242487921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 47.

The square root of 8242487921 is about 90788.1485712755. The cubic root of 8242487921 is about 2020.0065288323.

The spelling of 8242487921 in words is "eight billion, two hundred forty-two million, four hundred eighty-seven thousand, nine hundred twenty-one".