53992681 has 4 divisors (see below), whose sum is σ = 54527364. Its totient is φ = 53458000.

The previous prime is 53992639. The next prime is 53992709. The reversal of 53992681 is 18629935.

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: 18629935 = 5 ⋅3725987.

It can be written as a sum of positive squares in 2 ways, for example, as 52693081 + 1299600 = 7259^2 + 1140^2 .

It is a cyclic number.

It is not a de Polignac number, because 53992681 - 2¹¹ = 53990633 is a prime.

It is a super-2 number, since 2×53992681² = 5830419203135522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53992181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267190 + ... + 267391.

It is an arithmetic number, because the mean of its divisors is an integer number (13631841).

Almost surely, 2^53992681 is an apocalyptic number.

It is an amenable number.

53992681 is a deficient number, since it is larger than the sum of its proper divisors (534683).

53992681 is a wasteful number, since it uses less digits than its factorization.

53992681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534682.

The product of its digits is 116640, while the sum is 43.

The square root of 53992681 is about 7347.9712166012. The cubic root of 53992681 is about 377.9592376003.

The spelling of 53992681 in words is "fifty-three million, nine hundred ninety-two thousand, six hundred eighty-one".