53803661 has 12 divisors (see below), whose sum is σ = 56206332. Its totient is φ = 51465024.

The previous prime is 53803643. The next prime is 53803663. The reversal of 53803661 is 16630835.

It can be written as a sum of positive squares in 2 ways, for example, as 30580900 + 23222761 = 5530^2 + 4819^2 .

It is a de Polignac number, because none of the positive numbers 2^k-53803661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53803663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230801 + ... + 231033.

It is an arithmetic number, because the mean of its divisors is an integer number (4683861).

Almost surely, 2^53803661 is an apocalyptic number.

It is an amenable number.

53803661 is a deficient number, since it is larger than the sum of its proper divisors (2402671).

53803661 is an equidigital number, since it uses as much as digits as its factorization.

53803661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 53803661 is about 7335.0978861907. The cubic root of 53803661 is about 377.5176630187.

The spelling of 53803661 in words is "fifty-three million, eight hundred three thousand, six hundred sixty-one".