921219077 has 2 divisors, whose sum is σ = 921219078. Its totient is φ = 921219076.

The previous prime is 921219073. The next prime is 921219121. The reversal of 921219077 is 770912129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 888397636 + 32821441 = 29806^2 + 5729^2 .

It is a cyclic number.

It is not a de Polignac number, because 921219077 - 2² = 921219073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921219077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921219071) 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, 460609538 + 460609539.

It is an arithmetic number, because the mean of its divisors is an integer number (460609539).

Almost surely, 2^921219077 is an apocalyptic number.

It is an amenable number.

921219077 is a deficient number, since it is larger than the sum of its proper divisors (1).

921219077 is an equidigital number, since it uses as much as digits as its factorization.

921219077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 921219077 is about 30351.5910126636. The cubic root of 921219077 is about 973.0182238108.

The spelling of 921219077 in words is "nine hundred twenty-one million, two hundred nineteen thousand, seventy-seven".