1213520647 has 2 divisors, whose sum is σ = 1213520648. Its totient is φ = 1213520646.

The previous prime is 1213520629. The next prime is 1213520663. The reversal of 1213520647 is 7460253121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7460253121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213520647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213520617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606760323 + 606760324.

It is an arithmetic number, because the mean of its divisors is an integer number (606760324).

Almost surely, 2^1213520647 is an apocalyptic number.

1213520647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213520647 is an equidigital number, since it uses as much as digits as its factorization.

1213520647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1213520647 is about 34835.6232469006. The cubic root of 1213520647 is about 1066.6347372061.

Adding to 1213520647 its reverse (7460253121), we get a palindrome (8673773768).

The spelling of 1213520647 in words is "one billion, two hundred thirteen million, five hundred twenty thousand, six hundred forty-seven".