628533181 has 2 divisors, whose sum is σ = 628533182. Its totient is φ = 628533180.

The previous prime is 628533161. The next prime is 628533223. The reversal of 628533181 is 181335826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338376025 + 290157156 = 18395^2 + 17034^2 .

It is a cyclic number.

It is not a de Polignac number, because 628533181 - 2⁹ = 628532669 is a prime.

It is a super-2 number, since 2×628533181² = 790107919235957522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628533181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628533151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314266590 + 314266591.

It is an arithmetic number, because the mean of its divisors is an integer number (314266591).

Almost surely, 2^628533181 is an apocalyptic number.

It is an amenable number.

628533181 is a deficient number, since it is larger than the sum of its proper divisors (1).

628533181 is an equidigital number, since it uses as much as digits as its factorization.

628533181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 628533181 is about 25070.5640343412. The cubic root of 628533181 is about 856.5960547982.

The spelling of 628533181 in words is "six hundred twenty-eight million, five hundred thirty-three thousand, one hundred eighty-one".