53981221 has 4 divisors (see below), whose sum is σ = 61692832. Its totient is φ = 46269612.

The previous prime is 53981197. The next prime is 53981233. The reversal of 53981221 is 12218935.

53981221 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: 12218935 = 5 ⋅2443787.

It is a cyclic number.

It is not a de Polignac number, because 53981221 - 2⁹ = 53980709 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 (53981251) 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, 3855795 + ... + 3855808.

It is an arithmetic number, because the mean of its divisors is an integer number (15423208).

Almost surely, 2^53981221 is an apocalyptic number.

It is an amenable number.

53981221 is a deficient number, since it is larger than the sum of its proper divisors (7711611).

53981221 is an equidigital number, since it uses as much as digits as its factorization.

53981221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7711610.

The product of its digits is 4320, while the sum is 31.

The square root of 53981221 is about 7347.1913681352. The cubic root of 53981221 is about 377.9324949674.

The spelling of 53981221 in words is "fifty-three million, nine hundred eighty-one thousand, two hundred twenty-one".