53636621 has 4 divisors (see below), whose sum is σ = 55968672. Its totient is φ = 51304572.

The previous prime is 53636593. The next prime is 53636623. The reversal of 53636621 is 12663635.

53636621 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 Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12663635 = 5 ⋅2532727.

It is a cyclic number.

It is not a de Polignac number, because 53636621 - 2²² = 49442317 is a prime.

It is a super-2 number, since 2×53636621² = 5753774224595282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53636623) 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, 1165991 + ... + 1166036.

It is an arithmetic number, because the mean of its divisors is an integer number (13992168).

Almost surely, 2^53636621 is an apocalyptic number.

It is an amenable number.

53636621 is a deficient number, since it is larger than the sum of its proper divisors (2332051).

53636621 is a wasteful number, since it uses less digits than its factorization.

53636621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332050.

The product of its digits is 19440, while the sum is 32.

The square root of 53636621 is about 7323.7026837523. The cubic root of 53636621 is about 377.1265748674.

The spelling of 53636621 in words is "fifty-three million, six hundred thirty-six thousand, six hundred twenty-one".