255516181 has 2 divisors, whose sum is σ = 255516182. Its totient is φ = 255516180.

The previous prime is 255516143. The next prime is 255516203. The reversal of 255516181 is 181615552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232562500 + 22953681 = 15250^2 + 4791^2 .

It is a cyclic number.

It is not a de Polignac number, because 255516181 - 2⁹ = 255515669 is a prime.

It is a super-2 number, since 2×255516181² = 130577037505649522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255516101) 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, 127758090 + 127758091.

It is an arithmetic number, because the mean of its divisors is an integer number (127758091).

Almost surely, 2^255516181 is an apocalyptic number.

It is an amenable number.

255516181 is a deficient number, since it is larger than the sum of its proper divisors (1).

255516181 is an equidigital number, since it uses as much as digits as its factorization.

255516181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 34.

The square root of 255516181 is about 15984.8735059118. The cubic root of 255516181 is about 634.5601608256.

The spelling of 255516181 in words is "two hundred fifty-five million, five hundred sixteen thousand, one hundred eighty-one".