53349781 has 2 divisors, whose sum is σ = 53349782. Its totient is φ = 53349780.

The previous prime is 53349773. The next prime is 53349809. The reversal of 53349781 is 18794335.

53349781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52794756 + 555025 = 7266^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 53349781 - 2³ = 53349773 is a prime.

It is a super-2 number, since 2×53349781² = 5692398265495922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53349721) 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 as a sum of consecutive naturals, namely, 26674890 + 26674891.

It is an arithmetic number, because the mean of its divisors is an integer number (26674891).

Almost surely, 2^53349781 is an apocalyptic number.

It is an amenable number.

53349781 is a deficient number, since it is larger than the sum of its proper divisors (1).

53349781 is an equidigital number, since it uses as much as digits as its factorization.

53349781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 53349781 is about 7304.0934413519. The cubic root of 53349781 is about 376.4531021927.

The spelling of 53349781 in words is "fifty-three million, three hundred forty-nine thousand, seven hundred eighty-one".