617619649 has 4 divisors (see below), whose sum is σ = 619175764. Its totient is φ = 616063536.

The previous prime is 617619647. The next prime is 617619671. The reversal of 617619649 is 946916716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 316840000 + 300779649 = 17800^2 + 17343^2 .

It is a cyclic number.

It is not a de Polignac number, because 617619649 - 2¹ = 617619647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617619647) 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, 777462 + ... + 778255.

It is an arithmetic number, because the mean of its divisors is an integer number (154793941).

Almost surely, 2^617619649 is an apocalyptic number.

It is an amenable number.

617619649 is a deficient number, since it is larger than the sum of its proper divisors (1556115).

617619649 is a wasteful number, since it uses less digits than its factorization.

617619649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556114.

The product of its digits is 489888, while the sum is 49.

The square root of 617619649 is about 24851.9546313766. The cubic root of 617619649 is about 851.6092462124.

The spelling of 617619649 in words is "six hundred seventeen million, six hundred nineteen thousand, six hundred forty-nine".