1331684647 has 4 divisors (see below), whose sum is σ = 1410019056. Its totient is φ = 1253350240.

The previous prime is 1331684621. The next prime is 1331684663. The reversal of 1331684647 is 7464861331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331684647 is a prime.

It is a super-3 number, since 3×1331684647³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331684677) 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, 39167179 + ... + 39167212.

It is an arithmetic number, because the mean of its divisors is an integer number (352504764).

Almost surely, 2^1331684647 is an apocalyptic number.

1331684647 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1331684647 is a deficient number, since it is larger than the sum of its proper divisors (78334409).

1331684647 is an equidigital number, since it uses as much as digits as its factorization.

1331684647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78334408.

The product of its digits is 290304, while the sum is 43.

The square root of 1331684647 is about 36492.2546165621. The cubic root of 1331684647 is about 1100.1885756592.

It can be divided in two parts, 1331684 and 647, that added together give a palindrome (1332331).

The spelling of 1331684647 in words is "one billion, three hundred thirty-one million, six hundred eighty-four thousand, six hundred forty-seven".