53281391 has 4 divisors (see below), whose sum is σ = 53301000. Its totient is φ = 53261784.

The previous prime is 53281387. The next prime is 53281411. The reversal of 53281391 is 19318235.

53281391 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.

It is a cyclic number.

It is not a de Polignac number, because 53281391 - 2² = 53281387 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 (53281321) 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, 4916 + ... + 11433.

It is an arithmetic number, because the mean of its divisors is an integer number (13325250).

Almost surely, 2^53281391 is an apocalyptic number.

53281391 is a deficient number, since it is larger than the sum of its proper divisors (19609).

53281391 is a wasteful number, since it uses less digits than its factorization.

53281391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19608.

The product of its digits is 6480, while the sum is 32.

The square root of 53281391 is about 7299.4103186490. The cubic root of 53281391 is about 376.2921728426.

The spelling of 53281391 in words is "fifty-three million, two hundred eighty-one thousand, three hundred ninety-one".