391386241 has 2 divisors, whose sum is σ = 391386242. Its totient is φ = 391386240.

The previous prime is 391386199. The next prime is 391386271. The reversal of 391386241 is 142683193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204490000 + 186896241 = 14300^2 + 13671^2 .

It is a cyclic number.

It is not a de Polignac number, because 391386241 - 2¹¹ = 391384193 is a prime.

It is a super-2 number, since 2×391386241² = 306366379288220162, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 391386241.

It is not a weakly prime, because it can be changed into another prime (391386271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195693120 + 195693121.

It is an arithmetic number, because the mean of its divisors is an integer number (195693121).

Almost surely, 2^391386241 is an apocalyptic number.

It is an amenable number.

391386241 is a deficient number, since it is larger than the sum of its proper divisors (1).

391386241 is an equidigital number, since it uses as much as digits as its factorization.

391386241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 391386241 is about 19783.4840460420. The cubic root of 391386241 is about 731.4789812912.

The spelling of 391386241 in words is "three hundred ninety-one million, three hundred eighty-six thousand, two hundred forty-one".