909813 has 4 divisors (see below), whose sum is σ = 1213088. Its totient is φ = 606540.

The previous prime is 909809. The next prime is 909829. The reversal of 909813 is 318909.

It is a happy number.

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: 318909 = 3 ⋅106303.

It is not a de Polignac number, because 909813 - 2² = 909809 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151633 + ... + 151638.

It is an arithmetic number, because the mean of its divisors is an integer number (303272).

2⁹⁰⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

909813 is a deficient number, since it is larger than the sum of its proper divisors (303275).

909813 is a wasteful number, since it uses less digits than its factorization.

909813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303274.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 909813 is about 953.8411817488. The cubic root of 909813 is about 96.8985725501.

The spelling of 909813 in words is "nine hundred nine thousand, eight hundred thirteen".