1647745513 has 2 divisors, whose sum is σ = 1647745514. Its totient is φ = 1647745512.

The previous prime is 1647745501. The next prime is 1647745529. The reversal of 1647745513 is 3155477461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846402649 + 801342864 = 29093^2 + 28308^2 .

It is an emirp because it is prime and its reverse (3155477461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1647745513 is a prime.

It is a super-2 number, since 2×1647745513² = 5430130551223266338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1647745513.

It is not a weakly prime, because it can be changed into another prime (1647745543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823872756 + 823872757.

It is an arithmetic number, because the mean of its divisors is an integer number (823872757).

Almost surely, 2^1647745513 is an apocalyptic number.

It is an amenable number.

1647745513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647745513 is an equidigital number, since it uses as much as digits as its factorization.

1647745513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The square root of 1647745513 is about 40592.4317207038. The cubic root of 1647745513 is about 1181.1273132268.

The spelling of 1647745513 in words is "one billion, six hundred forty-seven million, seven hundred forty-five thousand, five hundred thirteen".