391067161 has 2 divisors, whose sum is σ = 391067162. Its totient is φ = 391067160.

The previous prime is 391067153. The next prime is 391067179. The reversal of 391067161 is 161760193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374616025 + 16451136 = 19355^2 + 4056^2 .

It is a cyclic number.

It is not a de Polignac number, because 391067161 - 2³ = 391067153 is a prime.

It is not a weakly prime, because it can be changed into another prime (391067111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195533580 + 195533581.

It is an arithmetic number, because the mean of its divisors is an integer number (195533581).

Almost surely, 2^391067161 is an apocalyptic number.

It is an amenable number.

391067161 is a deficient number, since it is larger than the sum of its proper divisors (1).

391067161 is an equidigital number, since it uses as much as digits as its factorization.

391067161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 391067161 is about 19775.4180992463. The cubic root of 391067161 is about 731.2801463599.

The spelling of 391067161 in words is "three hundred ninety-one million, sixty-seven thousand, one hundred sixty-one".