985052821 has 2 divisors, whose sum is σ = 985052822. Its totient is φ = 985052820.

The previous prime is 985052819. The next prime is 985052833. The reversal of 985052821 is 128250589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985018225 + 34596 = 31385^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 985052821 - 2¹ = 985052819 is a prime.

Together with 985052819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985052021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492526410 + 492526411.

It is an arithmetic number, because the mean of its divisors is an integer number (492526411).

Almost surely, 2^985052821 is an apocalyptic number.

It is an amenable number.

985052821 is a deficient number, since it is larger than the sum of its proper divisors (1).

985052821 is an equidigital number, since it uses as much as digits as its factorization.

985052821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 985052821 is about 31385.5511501710. The cubic root of 985052821 is about 994.9925745429.

The spelling of 985052821 in words is "nine hundred eighty-five million, fifty-two thousand, eight hundred twenty-one".