96639821 has 2 divisors, whose sum is σ = 96639822. Its totient is φ = 96639820.

The previous prime is 96639811. The next prime is 96639827. The reversal of 96639821 is 12893669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61058596 + 35581225 = 7814^2 + 5965^2 .

It is a cyclic number.

It is not a de Polignac number, because 96639821 - 2¹⁰ = 96638797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (96639827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48319910 + 48319911.

It is an arithmetic number, because the mean of its divisors is an integer number (48319911).

Almost surely, 2^96639821 is an apocalyptic number.

It is an amenable number.

96639821 is a deficient number, since it is larger than the sum of its proper divisors (1).

96639821 is an equidigital number, since it uses as much as digits as its factorization.

96639821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 96639821 is about 9830.5554776930. Note that the first 3 decimals coincide. The cubic root of 96639821 is about 458.9006846352.

The spelling of 96639821 in words is "ninety-six million, six hundred thirty-nine thousand, eight hundred twenty-one".