53690221 has 8 divisors (see below), whose sum is σ = 58063544. Its totient is φ = 49351680.

The previous prime is 53690209. The next prime is 53690227. The reversal of 53690221 is 12209635.

It can be written as a sum of positive squares in 4 ways, for example, as 34596 + 53655625 = 186^2 + 7325^2 .

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 53690221 - 2⁷ = 53690093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53690221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53690227) 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 7 ways as a sum of consecutive naturals, for example, 5436 + ... + 11701.

It is an arithmetic number, because the mean of its divisors is an integer number (7257943).

Almost surely, 2^53690221 is an apocalyptic number.

It is an amenable number.

53690221 is a deficient number, since it is larger than the sum of its proper divisors (4373323).

53690221 is a wasteful number, since it uses less digits than its factorization.

53690221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17391.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 53690221 is about 7327.3611211677. The cubic root of 53690221 is about 377.2521560741.

Adding to 53690221 its reverse (12209635), we get a palindrome (65899856).

The spelling of 53690221 in words is "fifty-three million, six hundred ninety thousand, two hundred twenty-one".