1647018049 has 2 divisors, whose sum is σ = 1647018050. Its totient is φ = 1647018048.

The previous prime is 1647018041. The next prime is 1647018161. The reversal of 1647018049 is 9408107461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1245737025 + 401281024 = 35295^2 + 20032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1647018049 - 2³ = 1647018041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1647018041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823509024 + 823509025.

It is an arithmetic number, because the mean of its divisors is an integer number (823509025).

Almost surely, 2^1647018049 is an apocalyptic number.

It is an amenable number.

1647018049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647018049 is an equidigital number, since it uses as much as digits as its factorization.

1647018049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1647018049 is about 40583.4701448755. The cubic root of 1647018049 is about 1180.9534688091.

The spelling of 1647018049 in words is "one billion, six hundred forty-seven million, eighteen thousand, forty-nine".