617825681 has 8 divisors (see below), whose sum is σ = 674248224. Its totient is φ = 561445920.

The previous prime is 617825651. The next prime is 617825729. The reversal of 617825681 is 186528716.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617825681 is a prime.

It is a super-2 number, since 2×617825681² = 763417144206227522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617825651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24581 + ... + 42893.

It is an arithmetic number, because the mean of its divisors is an integer number (84281028).

Almost surely, 2^617825681 is an apocalyptic number.

It is an amenable number.

617825681 is a deficient number, since it is larger than the sum of its proper divisors (56422543).

617825681 is a wasteful number, since it uses less digits than its factorization.

617825681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21391.

The product of its digits is 161280, while the sum is 44.

The square root of 617825681 is about 24856.0994727652. The cubic root of 617825681 is about 851.7039319141.

The spelling of 617825681 in words is "six hundred seventeen million, eight hundred twenty-five thousand, six hundred eighty-one".