6491382389 has 4 divisors (see below), whose sum is σ = 6613861356. Its totient is φ = 6368903424.

The previous prime is 6491382367. The next prime is 6491382407. The reversal of 6491382389 is 9832831946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5217606289 + 1273776100 = 72233^2 + 35690^2 .

It is a cyclic number.

It is not a de Polignac number, because 6491382389 - 2²⁰ = 6490333813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 122478913 = 6491382389 / (6 + 4 + 9 + 1 + 3 + 8 + 2 + 3 + 8 + 9).

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 6491382389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491382089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61239404 + ... + 61239509.

It is an arithmetic number, because the mean of its divisors is an integer number (1653465339).

Almost surely, 2^6491382389 is an apocalyptic number.

It is an amenable number.

6491382389 is a deficient number, since it is larger than the sum of its proper divisors (122478967).

6491382389 is a wasteful number, since it uses less digits than its factorization.

6491382389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122478966.

The product of its digits is 2239488, while the sum is 53.

The square root of 6491382389 is about 80569.1156026923. The cubic root of 6491382389 is about 1865.4304616274.

The spelling of 6491382389 in words is "six billion, four hundred ninety-one million, three hundred eighty-two thousand, three hundred eighty-nine".