1618968709 has 4 divisors (see below), whose sum is σ = 1619094060. Its totient is φ = 1618843360.

The previous prime is 1618968683. The next prime is 1618968713. The reversal of 1618968709 is 9078698161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 440076484 + 1178892225 = 20978^2 + 34335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618968709 - 2¹³ = 1618960517 is a prime.

It is a super-2 number, since 2×1618968709² = 5242119361442253362, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1618968709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618968209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40744 + ... + 69985.

It is an arithmetic number, because the mean of its divisors is an integer number (404773515).

Almost surely, 2^1618968709 is an apocalyptic number.

It is an amenable number.

1618968709 is a deficient number, since it is larger than the sum of its proper divisors (125351).

1618968709 is a wasteful number, since it uses less digits than its factorization.

1618968709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125350.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 1618968709 is about 40236.4102399804. The cubic root of 1618968709 is about 1174.2110192151.

The spelling of 1618968709 in words is "one billion, six hundred eighteen million, nine hundred sixty-eight thousand, seven hundred nine".