391384118449 has 9 divisors (see below), whose sum is σ = 400725291243. Its totient is φ = 382255886712.

The previous prime is 391384118431. The next prime is 391384118453. The reversal of 391384118449 is 944811483193.

The square root of 391384118449 is 625607.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 327020428449 + 64363690000 = 571857^2 + 253700^2 .

It is not a de Polignac number, because 391384118449 - 2¹⁷ = 391383987377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391384118449.

It is not an unprimeable number, because it can be changed into a prime (391334118449) 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 8 ways as a sum of consecutive naturals, for example, 26893827 + ... + 26908375.

Almost surely, 2^391384118449 is an apocalyptic number.

391384118449 is the 625607-th square number.

391384118449 is the 312804-th centered octagonal number.

It is an amenable number.

391384118449 is a deficient number, since it is larger than the sum of its proper divisors (9341172794).

391384118449 is an frugal number, since it uses more digits than its factorization.

391384118449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29184 (or 14592 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 55.

The spelling of 391384118449 in words is "three hundred ninety-one billion, three hundred eighty-four million, one hundred eighteen thousand, four hundred forty-nine".