617649 has 4 divisors (see below), whose sum is σ = 823536. Its totient is φ = 411764.

The previous prime is 617647. The next prime is 617651. The reversal of 617649 is 946716.

It is a happy number.

617649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is an interprime number because it is at equal distance from previous prime (617647) and next prime (617651).

It is a cyclic number.

It is not a de Polignac number, because 617649 - 2¹ = 617647 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 617649.

It is not an unprimeable number, because it can be changed into a prime (617647) 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, 102939 + ... + 102944.

It is an arithmetic number, because the mean of its divisors is an integer number (205884).

2⁶¹⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

617649 is a deficient number, since it is larger than the sum of its proper divisors (205887).

617649 is a wasteful number, since it uses less digits than its factorization.

617649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205886.

The product of its digits is 9072, while the sum is 33.

The square root of 617649 is about 785.9064829864. The cubic root of 617649 is about 85.1622736277.

The spelling of 617649 in words is "six hundred seventeen thousand, six hundred forty-nine".