5209681 has 4 divisors (see below), whose sum is σ = 5261364. Its totient is φ = 5158000.

The previous prime is 5209679. The next prime is 5209709. The reversal of 5209681 is 1869025.

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 2265025 + 2944656 = 1505^2 + 1716^2 .

It is a cyclic number.

It is not a de Polignac number, because 5209681 - 2¹ = 5209679 is a prime.

It is a super-2 number, since 2×5209681² = 54281552243522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5209601) 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, 25690 + ... + 25891.

It is an arithmetic number, because the mean of its divisors is an integer number (1315341).

Almost surely, 2^5209681 is an apocalyptic number.

It is an amenable number.

5209681 is a deficient number, since it is larger than the sum of its proper divisors (51683).

5209681 is a wasteful number, since it uses less digits than its factorization.

5209681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51682.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 5209681 is about 2282.4725628143. The cubic root of 5209681 is about 173.3552680164.

It can be divided in two parts, 520 and 9681, that added together give a palindrome (10201).

The spelling of 5209681 in words is "five million, two hundred nine thousand, six hundred eighty-one".