391216606 has 16 divisors (see below), whose sum is σ = 641646720. Its totient is φ = 177416280.

The previous prime is 391216601. The next prime is 391216627. The reversal of 391216606 is 606612193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391216601) 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 in 7 ways as a sum of consecutive naturals, for example, 10596 + ... + 29911.

It is an arithmetic number, because the mean of its divisors is an integer number (40102920).

Almost surely, 2^391216606 is an apocalyptic number.

391216606 is a deficient number, since it is larger than the sum of its proper divisors (250430114).

391216606 is a wasteful number, since it uses less digits than its factorization.

391216606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40959.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 391216606 is about 19779.1962930752. The cubic root of 391216606 is about 731.3732865791.

Adding to 391216606 its reverse (606612193), we get a palindrome (997828799).

The spelling of 391216606 in words is "three hundred ninety-one million, two hundred sixteen thousand, six hundred six".