913609 has 4 divisors (see below), whose sum is σ = 918400. Its totient is φ = 908820.

The previous prime is 913589. The next prime is 913637. The reversal of 913609 is 906319.

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: 906319 = 19 ⋅47701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-913609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (913639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097 + ... + 2494.

It is an arithmetic number, because the mean of its divisors is an integer number (229600).

2⁹¹³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

913609 is a deficient number, since it is larger than the sum of its proper divisors (4791).

913609 is a wasteful number, since it uses less digits than its factorization.

913609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 913609 is about 955.8289595948. The cubic root of 913609 is about 97.0331484114.

The spelling of 913609 in words is "nine hundred thirteen thousand, six hundred nine".