53683981 has 8 divisors (see below), whose sum is σ = 58606520. Its totient is φ = 48874752.

The previous prime is 53683969. The next prime is 53683997. The reversal of 53683981 is 18938635.

53683981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 14182756 + 39501225 = 3766^2 + 6285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53683981 - 2¹¹ = 53681933 is a prime.

It is a super-2 number, since 2×53683981² = 5763939632016722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53683921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27336 + ... + 29233.

It is an arithmetic number, because the mean of its divisors is an integer number (7325815).

Almost surely, 2^53683981 is an apocalyptic number.

It is an amenable number.

53683981 is a deficient number, since it is larger than the sum of its proper divisors (4922539).

53683981 is a wasteful number, since it uses less digits than its factorization.

53683981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56655.

The product of its digits is 155520, while the sum is 43.

The square root of 53683981 is about 7326.9353074802. The cubic root of 53683981 is about 377.2375404723.

The spelling of 53683981 in words is "fifty-three million, six hundred eighty-three thousand, nine hundred eighty-one".