53631521 has 4 divisors (see below), whose sum is σ = 53661972. Its totient is φ = 53601072.

The previous prime is 53631499. The next prime is 53631533. The reversal of 53631521 is 12513635.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 42315025 = 3364^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 53631521 - 2¹⁴ = 53615137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53631541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12410 + ... + 16163.

It is an arithmetic number, because the mean of its divisors is an integer number (13415493).

Almost surely, 2^53631521 is an apocalyptic number.

It is an amenable number.

53631521 is a deficient number, since it is larger than the sum of its proper divisors (30451).

53631521 is a wasteful number, since it uses less digits than its factorization.

53631521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30450.

The product of its digits is 2700, while the sum is 26.

The square root of 53631521 is about 7323.3544909420. The cubic root of 53631521 is about 377.1146215511.

The spelling of 53631521 in words is "fifty-three million, six hundred thirty-one thousand, five hundred twenty-one".