53563921 has 4 divisors (see below), whose sum is σ = 54038052. Its totient is φ = 53089792.

The previous prime is 53563903. The next prime is 53563943. The reversal of 53563921 is 12936535.

It is a happy number.

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 14326225 + 39237696 = 3785^2 + 6264^2 .

It is a cyclic number.

It is not a de Polignac number, because 53563921 - 2²³ = 45175313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53563981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236896 + ... + 237121.

It is an arithmetic number, because the mean of its divisors is an integer number (13509513).

Almost surely, 2^53563921 is an apocalyptic number.

It is an amenable number.

53563921 is a deficient number, since it is larger than the sum of its proper divisors (474131).

53563921 is a wasteful number, since it uses less digits than its factorization.

53563921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474130.

The product of its digits is 24300, while the sum is 34.

The square root of 53563921 is about 7318.7376643790. The cubic root of 53563921 is about 376.9561098753.

The spelling of 53563921 in words is "fifty-three million, five hundred sixty-three thousand, nine hundred twenty-one".