919609 has 4 divisors (see below), whose sum is σ = 959616. Its totient is φ = 879604.

The previous prime is 919591. The next prime is 919613. The reversal of 919609 is 906919.

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: 906919 = 13 ⋅69763.

It is a cyclic number.

It is not a de Polignac number, because 919609 - 2¹⁷ = 788537 is a prime.

It is a super-3 number, since 3×919609³ = 2333086784075350587, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19969 + ... + 20014.

It is an arithmetic number, because the mean of its divisors is an integer number (239904).

2⁹¹⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

919609 is a deficient number, since it is larger than the sum of its proper divisors (40007).

919609 is a wasteful number, since it uses less digits than its factorization.

919609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40006.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 919609 is about 958.9624601620. The cubic root of 919609 is about 97.2451023278.

The spelling of 919609 in words is "nine hundred nineteen thousand, six hundred nine".