53635621 has 8 divisors (see below), whose sum is σ = 57829464. Its totient is φ = 49451520.

The previous prime is 53635619. The next prime is 53635627. The reversal of 53635621 is 12653635.

It can be written as a sum of positive squares in 4 ways, for example, as 184900 + 53450721 = 430^2 + 7311^2 .

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 53635621 - 2¹ = 53635619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53635627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12381 + ... + 16141.

It is an arithmetic number, because the mean of its divisors is an integer number (7228683).

Almost surely, 2^53635621 is an apocalyptic number.

It is an amenable number.

53635621 is a deficient number, since it is larger than the sum of its proper divisors (4193843).

53635621 is a wasteful number, since it uses less digits than its factorization.

53635621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4871.

The product of its digits is 16200, while the sum is 31.

The square root of 53635621 is about 7323.6344119569. The cubic root of 53635621 is about 377.1242311396.

The spelling of 53635621 in words is "fifty-three million, six hundred thirty-five thousand, six hundred twenty-one".