1331247647 has 2 divisors, whose sum is σ = 1331247648. Its totient is φ = 1331247646.

The previous prime is 1331247623. The next prime is 1331247649. The reversal of 1331247647 is 7467421331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331247647 - 2⁶ = 1331247583 is a prime.

Together with 1331247649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331247647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331247649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665623823 + 665623824.

It is an arithmetic number, because the mean of its divisors is an integer number (665623824).

Almost surely, 2^1331247647 is an apocalyptic number.

1331247647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331247647 is an equidigital number, since it uses as much as digits as its factorization.

1331247647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 38.

The square root of 1331247647 is about 36486.2665533211. The cubic root of 1331247647 is about 1100.0682180833.

Adding to 1331247647 its reverse (7467421331), we get a palindrome (8798668978).

The spelling of 1331247647 in words is "one billion, three hundred thirty-one million, two hundred forty-seven thousand, six hundred forty-seven".