1391354716249 has 15 divisors (see below), whose sum is σ = 1419020320235. Its totient is φ = 1364228443920.

The previous prime is 1391354716243. The next prime is 1391354716253. The reversal of 1391354716249 is 9426174531931.

It is a happy number.

The square root of 1391354716249 is 1179557.

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

It can be written as a sum of positive squares in 7 ways, for example, as 445536225225 + 945818491024 = 667485^2 + 972532^2 .

It is not a de Polignac number, because 1391354716249 - 2¹⁷ = 1391354585177 is a prime.

It is a Duffinian number.

Its product of digits (4898880) is a multiple of the sum of its prime divisors (378).

It is a self number, because there is not a number n which added to its sum of digits gives 1391354716249.

It is not an unprimeable number, because it can be changed into a prime (1391354716243) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4389131439 + ... + 4389131755.

Almost surely, 2^{1391354716249} is an apocalyptic number.

1391354716249 is the 1179557-th square number.

1391354716249 is the 589779-th centered octagonal number.

It is an amenable number.

1391354716249 is a deficient number, since it is larger than the sum of its proper divisors (27665603986).

1391354716249 is an frugal number, since it uses more digits than its factorization.

1391354716249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 378 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 55.

The spelling of 1391354716249 in words is "one trillion, three hundred ninety-one billion, three hundred fifty-four million, seven hundred sixteen thousand, two hundred forty-nine".