9976921 has 2 divisors, whose sum is σ = 9976922. Its totient is φ = 9976920.

The previous prime is 9976913. The next prime is 9976927. The reversal of 9976921 is 1296799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6056521 + 3920400 = 2461^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 9976921 - 2³ = 9976913 is a prime.

9976921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9976927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988460 + 4988461.

It is an arithmetic number, because the mean of its divisors is an integer number (4988461).

Almost surely, 2^9976921 is an apocalyptic number.

It is an amenable number.

9976921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9976921 is an equidigital number, since it uses as much as digits as its factorization.

9976921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 9976921 is about 3158.6264419839. The cubic root of 9976921 is about 215.2776006745.

The spelling of 9976921 in words is "nine million, nine hundred seventy-six thousand, nine hundred twenty-one".