1913134509 has 72 divisors (see below), whose sum is σ = 3289014456. Its totient is φ = 1064448000.

The previous prime is 1913134507. The next prime is 1913134519. The reversal of 1913134509 is 9054313191.

1913134509 is a `hidden beast` number, since 1 + 9 + 13 + 134 + 509 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 318729609 + 1594404900 = 17853^2 + 39930^2 .

It is not a de Polignac number, because 1913134509 - 2¹ = 1913134507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913134507) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4770709 + ... + 4771109.

Almost surely, 2^1913134509 is an apocalyptic number.

It is an amenable number.

1913134509 is a deficient number, since it is larger than the sum of its proper divisors (1375879947).

1913134509 is a wasteful number, since it uses less digits than its factorization.

1913134509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 1913134509 is about 43739.3931027855. The cubic root of 1913134509 is about 1241.4097972150.

The spelling of 1913134509 in words is "one billion, nine hundred thirteen million, one hundred thirty-four thousand, five hundred nine".