391660103 has 2 divisors, whose sum is σ = 391660104. Its totient is φ = 391660102.

The previous prime is 391660097. The next prime is 391660153. The reversal of 391660103 is 301066193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391660103 - 2¹⁴ = 391643719 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391660153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195830051 + 195830052.

It is an arithmetic number, because the mean of its divisors is an integer number (195830052).

Almost surely, 2^391660103 is an apocalyptic number.

391660103 is a deficient number, since it is larger than the sum of its proper divisors (1).

391660103 is an equidigital number, since it uses as much as digits as its factorization.

391660103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 391660103 is about 19790.4043162337. The cubic root of 391660103 is about 731.6495524305.

The spelling of 391660103 in words is "three hundred ninety-one million, six hundred sixty thousand, one hundred three".