997802161 has 2 divisors, whose sum is σ = 997802162. Its totient is φ = 997802160.

The previous prime is 997802149. The next prime is 997802167. The reversal of 997802161 is 161208799.

997802161 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., 705221136 + 292581025 = 26556^2 + 17105^2 .

It is a cyclic number.

It is not a de Polignac number, because 997802161 - 2¹³ = 997793969 is a prime.

It is not a weakly prime, because it can be changed into another prime (997802167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498901080 + 498901081.

It is an arithmetic number, because the mean of its divisors is an integer number (498901081).

Almost surely, 2^997802161 is an apocalyptic number.

It is an amenable number.

997802161 is a deficient number, since it is larger than the sum of its proper divisors (1).

997802161 is an equidigital number, since it uses as much as digits as its factorization.

997802161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 997802161 is about 31588.0066006071. The cubic root of 997802161 is about 999.2668496219.

The spelling of 997802161 in words is "nine hundred ninety-seven million, eight hundred two thousand, one hundred sixty-one".