53220981 has 16 divisors (see below), whose sum is σ = 78571008. Its totient is φ = 31772400.

The previous prime is 53220917. The next prime is 53220983. The reversal of 53220981 is 18902235.

It is a happy number.

53220981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 53220981 - 2⁶ = 53220917 is a prime.

It is a super-2 number, since 2×53220981² = 5664945637204722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53220983) 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 15 ways as a sum of consecutive naturals, for example, 9825 + ... + 14246.

It is an arithmetic number, because the mean of its divisors is an integer number (4910688).

Almost surely, 2^53220981 is an apocalyptic number.

It is an amenable number.

53220981 is a deficient number, since it is larger than the sum of its proper divisors (25350027).

53220981 is a wasteful number, since it uses less digits than its factorization.

53220981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24152.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 53220981 is about 7295.2711395808. The cubic root of 53220981 is about 376.1499067456.

The spelling of 53220981 in words is "fifty-three million, two hundred twenty thousand, nine hundred eighty-one".