391249363 has 2 divisors, whose sum is σ = 391249364. Its totient is φ = 391249362.

The previous prime is 391249337. The next prime is 391249379. The reversal of 391249363 is 363942193.

It is a strong prime.

It is an emirp because it is prime and its reverse (363942193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391249363 - 2¹⁷ = 391118291 is a prime.

It is not a weakly prime, because it can be changed into another prime (391249393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195624681 + 195624682.

It is an arithmetic number, because the mean of its divisors is an integer number (195624682).

Almost surely, 2^391249363 is an apocalyptic number.

391249363 is a deficient number, since it is larger than the sum of its proper divisors (1).

391249363 is an equidigital number, since it uses as much as digits as its factorization.

391249363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 40.

The square root of 391249363 is about 19780.0243427555. The cubic root of 391249363 is about 731.3936989080.

The spelling of 391249363 in words is "three hundred ninety-one million, two hundred forty-nine thousand, three hundred sixty-three".