123581617 has 4 divisors (see below), whose sum is σ = 123612516. Its totient is φ = 123550720.

The previous prime is 123581581. The next prime is 123581629. The reversal of 123581617 is 716185321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716185321 = 18401 ⋅38921.

It can be written as a sum of positive squares in 2 ways, for example, as 98089216 + 25492401 = 9904^2 + 5049^2 .

It is a cyclic number.

It is not a de Polignac number, because 123581617 - 2¹¹ = 123579569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123581657) 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, 8368 + ... + 17809.

It is an arithmetic number, because the mean of its divisors is an integer number (30903129).

Almost surely, 2^123581617 is an apocalyptic number.

It is an amenable number.

123581617 is a deficient number, since it is larger than the sum of its proper divisors (30899).

123581617 is an equidigital number, since it uses as much as digits as its factorization.

123581617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30898.

The product of its digits is 10080, while the sum is 34.

The square root of 123581617 is about 11116.7269013860. The cubic root of 123581617 is about 498.1016241267.

The spelling of 123581617 in words is "one hundred twenty-three million, five hundred eighty-one thousand, six hundred seventeen".