10977821 has 2 divisors, whose sum is σ = 10977822. Its totient is φ = 10977820.

The previous prime is 10977809. The next prime is 10977823. The reversal of 10977821 is 12877901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 648025 = 3214^2 + 805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10977821 is a prime.

Together with 10977823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10977823) 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, 5488910 + 5488911.

It is an arithmetic number, because the mean of its divisors is an integer number (5488911).

Almost surely, 2^10977821 is an apocalyptic number.

It is an amenable number.

10977821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10977821 is an equidigital number, since it uses as much as digits as its factorization.

10977821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 10977821 is about 3313.2794931910. The cubic root of 10977821 is about 222.2484368056.

The spelling of 10977821 in words is "ten million, nine hundred seventy-seven thousand, eight hundred twenty-one".