9977021 has 2 divisors, whose sum is σ = 9977022. Its totient is φ = 9977020.

The previous prime is 9976937. The next prime is 9977027. The reversal of 9977021 is 1207799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8323225 + 1653796 = 2885^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 9977021 - 2²² = 5782717 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9977027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988510 + 4988511.

It is an arithmetic number, because the mean of its divisors is an integer number (4988511).

Almost surely, 2^9977021 is an apocalyptic number.

It is an amenable number.

9977021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9977021 is an equidigital number, since it uses as much as digits as its factorization.

9977021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 9977021 is about 3158.6422716097. The cubic root of 9977021 is about 215.2783199240.

The spelling of 9977021 in words is "nine million, nine hundred seventy-seven thousand, twenty-one".