899916509 has 4 divisors (see below), whose sum is σ = 900031680. Its totient is φ = 899801340.

The previous prime is 899916497. The next prime is 899916517. The reversal of 899916509 is 905619998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905619998 = 2 ⋅452809999.

It is a cyclic number.

It is not a de Polignac number, because 899916509 - 2¹² = 899912413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899916559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44939 + ... + 61800.

It is an arithmetic number, because the mean of its divisors is an integer number (225007920).

Almost surely, 2^899916509 is an apocalyptic number.

It is an amenable number.

899916509 is a deficient number, since it is larger than the sum of its proper divisors (115171).

899916509 is a wasteful number, since it uses less digits than its factorization.

899916509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115170.

The product of its (nonzero) digits is 1574640, while the sum is 56.

The square root of 899916509 is about 29998.6084510599. The cubic root of 899916509 is about 965.4595282475.

The spelling of 899916509 in words is "eight hundred ninety-nine million, nine hundred sixteen thousand, five hundred nine".