921835661 has 2 divisors, whose sum is σ = 921835662. Its totient is φ = 921835660.

The previous prime is 921835631. The next prime is 921835679. The reversal of 921835661 is 166538129.

921835661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766957636 + 154878025 = 27694^2 + 12445^2 .

It is an emirp because it is prime and its reverse (166538129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921835661 - 2²² = 917641357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921835601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460917830 + 460917831.

It is an arithmetic number, because the mean of its divisors is an integer number (460917831).

Almost surely, 2^921835661 is an apocalyptic number.

It is an amenable number.

921835661 is a deficient number, since it is larger than the sum of its proper divisors (1).

921835661 is an equidigital number, since it uses as much as digits as its factorization.

921835661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 921835661 is about 30361.7466724166. The cubic root of 921835661 is about 973.2352600122.

The spelling of 921835661 in words is "nine hundred twenty-one million, eight hundred thirty-five thousand, six hundred sixty-one".