628199081 has 2 divisors, whose sum is σ = 628199082. Its totient is φ = 628199080.

The previous prime is 628199059. The next prime is 628199087. The reversal of 628199081 is 180991826.

628199081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575040400 + 53158681 = 23980^2 + 7291^2 .

It is a cyclic number.

It is not a de Polignac number, because 628199081 - 2¹⁸ = 627936937 is a prime.

It is a super-2 number, since 2×628199081² = 789268170738489122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628199087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314099540 + 314099541.

It is an arithmetic number, because the mean of its divisors is an integer number (314099541).

Almost surely, 2^628199081 is an apocalyptic number.

It is an amenable number.

628199081 is a deficient number, since it is larger than the sum of its proper divisors (1).

628199081 is an equidigital number, since it uses as much as digits as its factorization.

628199081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 628199081 is about 25063.8999559127. The cubic root of 628199081 is about 856.4442519054. Note that the first 3 decimals are identical.

The spelling of 628199081 in words is "six hundred twenty-eight million, one hundred ninety-nine thousand, eighty-one".