1008913775809 has 9 divisors (see below), whose sum is σ = 1011135467811. Its totient is φ = 1006696961280.

The previous prime is 1008913775791. The next prime is 1008913775827. The reversal of 1008913775809 is 9085773198001.

The square root of 1008913775809 is 1004447.

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

It is an interprime number because it is at equal distance from previous prime (1008913775791) and next prime (1008913775827).

It can be written as a sum of positive squares in only one way, i.e., 910694215809 + 98219560000 = 954303^2 + 313400^2 .

It is not a de Polignac number, because 1008913775809 - 2⁵ = 1008913775777 is a prime.

It is a super-2 number, since 2×1008913775809² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1008913772809) 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, 643849744 + ... + 643851310.

Almost surely, 2^{1008913775809} is an apocalyptic number.

1008913775809 is the 1004447-th square number.

1008913775809 is the 502224-th centered octagonal number.

It is an amenable number.

1008913775809 is a deficient number, since it is larger than the sum of its proper divisors (2221692002).

1008913775809 is an frugal number, since it uses more digits than its factorization.

1008913775809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4416 (or 2208 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 1008913775809 in words is "one trillion, eight billion, nine hundred thirteen million, seven hundred seventy-five thousand, eight hundred nine".