820346249 has 2 divisors, whose sum is σ = 820346250. Its totient is φ = 820346248.

The previous prime is 820346227. The next prime is 820346279. The reversal of 820346249 is 942643028.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709423225 + 110923024 = 26635^2 + 10532^2 .

It is a cyclic number.

It is not a de Polignac number, because 820346249 - 2¹² = 820342153 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (820346279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410173124 + 410173125.

It is an arithmetic number, because the mean of its divisors is an integer number (410173125).

Almost surely, 2^820346249 is an apocalyptic number.

It is an amenable number.

820346249 is a deficient number, since it is larger than the sum of its proper divisors (1).

820346249 is an equidigital number, since it uses as much as digits as its factorization.

820346249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 820346249 is about 28641.6872582605. The cubic root of 820346249 is about 936.1218859128.

The spelling of 820346249 in words is "eight hundred twenty million, three hundred forty-six thousand, two hundred forty-nine".