391955063 has 2 divisors, whose sum is σ = 391955064. Its totient is φ = 391955062.

The previous prime is 391955027. The next prime is 391955093. The reversal of 391955063 is 360559193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391955063 - 2¹² = 391950967 is a prime.

It is a super-2 number, since 2×391955063² = 307257542822667938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 391955063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391955093) 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, 195977531 + 195977532.

It is an arithmetic number, because the mean of its divisors is an integer number (195977532).

Almost surely, 2^391955063 is an apocalyptic number.

391955063 is a deficient number, since it is larger than the sum of its proper divisors (1).

391955063 is an equidigital number, since it uses as much as digits as its factorization.

391955063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109350, while the sum is 41.

The square root of 391955063 is about 19797.8550100762. The cubic root of 391955063 is about 731.8331752521.

The spelling of 391955063 in words is "three hundred ninety-one million, nine hundred fifty-five thousand, sixty-three".