391049149 has 2 divisors, whose sum is σ = 391049150. Its totient is φ = 391049148.

The previous prime is 391049123. The next prime is 391049161. The reversal of 391049149 is 941940193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390852900 + 196249 = 19770^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 391049149 - 2¹⁹ = 390524861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391049119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195524574 + 195524575.

It is an arithmetic number, because the mean of its divisors is an integer number (195524575).

Almost surely, 2^391049149 is an apocalyptic number.

It is an amenable number.

391049149 is a deficient number, since it is larger than the sum of its proper divisors (1).

391049149 is an equidigital number, since it uses as much as digits as its factorization.

391049149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 391049149 is about 19774.9626801165. The cubic root of 391049149 is about 731.2689189446.

The spelling of 391049149 in words is "three hundred ninety-one million, forty-nine thousand, one hundred forty-nine".