391658038049 has 2 divisors, whose sum is σ = 391658038050. Its totient is φ = 391658038048.

The previous prime is 391658037973. The next prime is 391658038067. The reversal of 391658038049 is 940830856193.

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., 206813933824 + 184844104225 = 454768^2 + 429935^2 .

It is a cyclic number.

It is not a de Polignac number, because 391658038049 - 2²⁴ = 391641260833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391658037985 and 391658038003.

It is not a weakly prime, because it can be changed into another prime (391658038249) 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, 195829019024 + 195829019025.

It is an arithmetic number, because the mean of its divisors is an integer number (195829019025).

Almost surely, 2^391658038049 is an apocalyptic number.

It is an amenable number.

391658038049 is a deficient number, since it is larger than the sum of its proper divisors (1).

391658038049 is an equidigital number, since it uses as much as digits as its factorization.

391658038049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 391658038049 in words is "three hundred ninety-one billion, six hundred fifty-eight million, thirty-eight thousand, forty-nine".