391767161 has 2 divisors, whose sum is σ = 391767162. Its totient is φ = 391767160.

The previous prime is 391767113. The next prime is 391767197. The reversal of 391767161 is 161767193.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371911225 + 19855936 = 19285^2 + 4456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391767161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (391757161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195883580 + 195883581.

It is an arithmetic number, because the mean of its divisors is an integer number (195883581).

Almost surely, 2^391767161 is an apocalyptic number.

It is an amenable number.

391767161 is a deficient number, since it is larger than the sum of its proper divisors (1).

391767161 is an equidigital number, since it uses as much as digits as its factorization.

391767161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 41.

The square root of 391767161 is about 19793.1089270988. The cubic root of 391767161 is about 731.7162104003.

The spelling of 391767161 in words is "three hundred ninety-one million, seven hundred sixty-seven thousand, one hundred sixty-one".