617425721 has 8 divisors (see below), whose sum is σ = 677047584. Its totient is φ = 558385920.

The previous prime is 617425687. The next prime is 617425733. The reversal of 617425721 is 127524716.

617425721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 617425721 - 2⁶ = 617425657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617425741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143291 + ... + 147536.

It is an arithmetic number, because the mean of its divisors is an integer number (84630948).

Almost surely, 2^617425721 is an apocalyptic number.

It is an amenable number.

617425721 is a deficient number, since it is larger than the sum of its proper divisors (59621863).

617425721 is a wasteful number, since it uses less digits than its factorization.

617425721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291031.

The product of its digits is 23520, while the sum is 35.

The square root of 617425721 is about 24848.0526601181. The cubic root of 617425721 is about 851.5201038810.

The spelling of 617425721 in words is "six hundred seventeen million, four hundred twenty-five thousand, seven hundred twenty-one".