391168049 has 2 divisors, whose sum is σ = 391168050. Its totient is φ = 391168048.

The previous prime is 391168021. The next prime is 391168093. The reversal of 391168049 is 940861193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369869824 + 21298225 = 19232^2 + 4615^2 .

It is a cyclic number.

It is not a de Polignac number, because 391168049 - 2²⁸ = 122732593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391167997 and 391168015.

It is not a weakly prime, because it can be changed into another prime (391161049) 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, 195584024 + 195584025.

It is an arithmetic number, because the mean of its divisors is an integer number (195584025).

Almost surely, 2^391168049 is an apocalyptic number.

It is an amenable number.

391168049 is a deficient number, since it is larger than the sum of its proper divisors (1).

391168049 is an equidigital number, since it uses as much as digits as its factorization.

391168049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 391168049 is about 19777.9687784160. The cubic root of 391168049 is about 731.3430264781.

The spelling of 391168049 in words is "three hundred ninety-one million, one hundred sixty-eight thousand, forty-nine".