53116781 has 2 divisors, whose sum is σ = 53116782. Its totient is φ = 53116780.

The previous prime is 53116769. The next prime is 53116807. The reversal of 53116781 is 18761135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 1779556 = 7165^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 53116781 - 2⁶ = 53116717 is a prime.

It is a super-2 number, since 2×53116781² = 5642784847603922, 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 (53116181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26558390 + 26558391.

It is an arithmetic number, because the mean of its divisors is an integer number (26558391).

Almost surely, 2^53116781 is an apocalyptic number.

It is an amenable number.

53116781 is a deficient number, since it is larger than the sum of its proper divisors (1).

53116781 is an equidigital number, since it uses as much as digits as its factorization.

53116781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 53116781 is about 7288.1260279992. The cubic root of 53116781 is about 375.9042615951.

The spelling of 53116781 in words is "fifty-three million, one hundred sixteen thousand, seven hundred eighty-one".