53323981 has 2 divisors, whose sum is σ = 53323982. Its totient is φ = 53323980.

The previous prime is 53323979. The next prime is 53323987. The reversal of 53323981 is 18932335.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 14945956 = 6195^2 + 3866^2 .

It is a cyclic number.

It is not a de Polignac number, because 53323981 - 2¹ = 53323979 is a prime.

It is a super-3 number, since 3×53323981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 53323979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53323987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26661990 + 26661991.

It is an arithmetic number, because the mean of its divisors is an integer number (26661991).

Almost surely, 2^53323981 is an apocalyptic number.

It is an amenable number.

53323981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53323981 is an equidigital number, since it uses as much as digits as its factorization.

53323981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 53323981 is about 7302.3270948376. The cubic root of 53323981 is about 376.3924080597.

The spelling of 53323981 in words is "fifty-three million, three hundred twenty-three thousand, nine hundred eighty-one".