53857681 has 4 divisors (see below), whose sum is σ = 55313332. Its totient is φ = 52402032.

The previous prime is 53857679. The next prime is 53857703. The reversal of 53857681 is 18675835.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18675835 = 5 ⋅3735167.

It can be written as a sum of positive squares in 2 ways, for example, as 43560000 + 10297681 = 6600^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 53857681 - 2¹ = 53857679 is a prime.

It is a super-2 number, since 2×53857681² = 5801299605395522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53857631) 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, 727770 + ... + 727843.

It is an arithmetic number, because the mean of its divisors is an integer number (13828333).

Almost surely, 2^53857681 is an apocalyptic number.

It is an amenable number.

53857681 is a deficient number, since it is larger than the sum of its proper divisors (1455651).

53857681 is a wasteful number, since it uses less digits than its factorization.

53857681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455650.

The product of its digits is 201600, while the sum is 43.

The square root of 53857681 is about 7338.7792581600. The cubic root of 53857681 is about 377.6439659655.

The spelling of 53857681 in words is "fifty-three million, eight hundred fifty-seven thousand, six hundred eighty-one".