1649659717 has 2 divisors, whose sum is σ = 1649659718. Its totient is φ = 1649659716.

The previous prime is 1649659703. The next prime is 1649659741. The reversal of 1649659717 is 7179569461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485794116 + 163865601 = 38546^2 + 12801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649659717 - 2¹⁹ = 1649135429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649659757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824829858 + 824829859.

It is an arithmetic number, because the mean of its divisors is an integer number (824829859).

Almost surely, 2^1649659717 is an apocalyptic number.

It is an amenable number.

1649659717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649659717 is an equidigital number, since it uses as much as digits as its factorization.

1649659717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 1649659717 is about 40616.0032130194. The cubic root of 1649659717 is about 1181.5845124045.

The spelling of 1649659717 in words is "one billion, six hundred forty-nine million, six hundred fifty-nine thousand, seven hundred seventeen".