820208297 has 2 divisors, whose sum is σ = 820208298. Its totient is φ = 820208296.

The previous prime is 820208269. The next prime is 820208303. The reversal of 820208297 is 792802028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753557401 + 66650896 = 27451^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 820208297 - 2¹⁶ = 820142761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820208297.

It is not a weakly prime, because it can be changed into another prime (820208237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410104148 + 410104149.

It is an arithmetic number, because the mean of its divisors is an integer number (410104149).

Almost surely, 2^820208297 is an apocalyptic number.

It is an amenable number.

820208297 is a deficient number, since it is larger than the sum of its proper divisors (1).

820208297 is an equidigital number, since it uses as much as digits as its factorization.

820208297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 820208297 is about 28639.2789189951. The cubic root of 820208297 is about 936.0694092397.

The spelling of 820208297 in words is "eight hundred twenty million, two hundred eight thousand, two hundred ninety-seven".