5123681 has 6 divisors (see below), whose sum is σ = 5443110. Its totient is φ = 4822016.

The previous prime is 5123639. The next prime is 5123683. The reversal of 5123681 is 1863215.

It can be written as a sum of positive squares in 3 ways, for example, as 2512225 + 2611456 = 1585^2 + 1616^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5123681 is a prime.

It is a super-2 number, since 2×5123681² = 52504213979522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 5123681.

It is not an unprimeable number, because it can be changed into a prime (5123683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8576 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (907185).

Almost surely, 2^5123681 is an apocalyptic number.

It is an amenable number.

5123681 is a deficient number, since it is larger than the sum of its proper divisors (319429).

5123681 is a wasteful number, since it uses less digits than its factorization.

5123681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17763 (or 17746 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 5123681 is about 2263.5549474223. The cubic root of 5123681 is about 172.3960698605.

Adding to 5123681 its reverse (1863215), we get a palindrome (6986896).

It can be divided in two parts, 51 and 23681, that added together give a palindrome (23732).

The spelling of 5123681 in words is "five million, one hundred twenty-three thousand, six hundred eighty-one".