53503661 has 4 divisors (see below), whose sum is σ = 53518524. Its totient is φ = 53488800.

The previous prime is 53503643. The next prime is 53503669. The reversal of 53503661 is 16630535.

53503661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16630535 = 5 ⋅3326107.

It can be written as a sum of positive squares in 2 ways, for example, as 7873636 + 45630025 = 2806^2 + 6755^2 .

It is a cyclic number.

It is not a de Polignac number, because 53503661 - 2²² = 49309357 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 (53503669) 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 3 ways as a sum of consecutive naturals, for example, 1751 + ... + 10491.

It is an arithmetic number, because the mean of its divisors is an integer number (13379631).

Almost surely, 2^53503661 is an apocalyptic number.

It is an amenable number.

53503661 is a deficient number, since it is larger than the sum of its proper divisors (14863).

53503661 is an equidigital number, since it uses as much as digits as its factorization.

53503661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14862.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 53503661 is about 7314.6196756906. The cubic root of 53503661 is about 376.8146969090.

The spelling of 53503661 in words is "fifty-three million, five hundred three thousand, six hundred sixty-one".