1709243649 has 9 divisors (see below), whose sum is σ = 2469086659. Its totient is φ = 1139413080.

The previous prime is 1709243609. The next prime is 1709243659. The reversal of 1709243649 is 9463429071.

It is a happy number.

The square root of 1709243649 is 41343.

It is a perfect power (a square), and thus also a powerful number.

1709243649 is a `hidden beast` number, since 170 + 9 + 2 + 436 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 977000049 + 732243600 = 31257^2 + 27060^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1709243649 - 2¹¹ = 1709241601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1709243609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 117139 + ... + 130919.

Almost surely, 2^1709243649 is an apocalyptic number.

1709243649 is the 41343-rd square number.

1709243649 is the 20672-nd centered octagonal number.

It is an amenable number.

1709243649 is a deficient number, since it is larger than the sum of its proper divisors (759843010).

1709243649 is an frugal number, since it uses more digits than its factorization.

1709243649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27568 (or 13784 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The cubic root of 1709243649 is about 1195.6424476848.

The spelling of 1709243649 in words is "one billion, seven hundred nine million, two hundred forty-three thousand, six hundred forty-nine".