913881609 has 20 divisors (see below), whose sum is σ = 1424539776. Its totient is φ = 582763896.

The previous prime is 913881607. The next prime is 913881613. The reversal of 913881609 is 906188319.

913881609 is a `hidden beast` number, since 9 + 1 + 38 + 8 + 1 + 609 = 666.

913881609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 913881609 - 2¹ = 913881607 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (913881607) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 243409 + ... + 247134.

Almost surely, 2^913881609 is an apocalyptic number.

It is an amenable number.

913881609 is a deficient number, since it is larger than the sum of its proper divisors (510658167).

913881609 is a wasteful number, since it uses less digits than its factorization.

913881609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490578 (or 490569 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 913881609 is about 30230.4748391420. The cubic root of 913881609 is about 970.4279859323.

The spelling of 913881609 in words is "nine hundred thirteen million, eight hundred eighty-one thousand, six hundred nine".