11315181609 has 6 divisors (see below), whose sum is σ = 16344151226. Its totient is φ = 7543454400.

The previous prime is 11315181607. The next prime is 11315181611. The reversal of 11315181609 is 90618151311.

11315181609 is a `hidden beast` number, since 1 + 1 + 31 + 5 + 18 + 1 + 609 = 666.

It is an interprime number because it is at equal distance from previous prime (11315181607) and next prime (11315181611).

It can be written as a sum of positive squares in only one way, i.e., 10883705625 + 431475984 = 104325^2 + 20772^2 .

It is not a de Polignac number, because 11315181609 - 2¹ = 11315181607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11315181607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628621192 + ... + 628621209.

Almost surely, 2^11315181609 is an apocalyptic number.

It is an amenable number.

11315181609 is a deficient number, since it is larger than the sum of its proper divisors (5028969617).

11315181609 is a wasteful number, since it uses less digits than its factorization.

11315181609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257242407 (or 1257242404 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The spelling of 11315181609 in words is "eleven billion, three hundred fifteen million, one hundred eighty-one thousand, six hundred nine".