53118181 has 2 divisors, whose sum is σ = 53118182. Its totient is φ = 53118180.

The previous prime is 53118173. The next prime is 53118187. The reversal of 53118181 is 18181135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35402500 + 17715681 = 5950^2 + 4209^2 .

It is a cyclic number.

It is not a de Polignac number, because 53118181 - 2³ = 53118173 is a prime.

It is a super-2 number, since 2×53118181² = 5643082305497522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53118187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26559090 + 26559091.

It is an arithmetic number, because the mean of its divisors is an integer number (26559091).

Almost surely, 2^53118181 is an apocalyptic number.

It is an amenable number.

53118181 is a deficient number, since it is larger than the sum of its proper divisors (1).

53118181 is an equidigital number, since it uses as much as digits as its factorization.

53118181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 28.

The square root of 53118181 is about 7288.2220740041. Note that the first 3 decimals coincide. The cubic root of 53118181 is about 375.9075641380.

The spelling of 53118181 in words is "fifty-three million, one hundred eighteen thousand, one hundred eighty-one".