628697101 has 2 divisors, whose sum is σ = 628697102. Its totient is φ = 628697100.

The previous prime is 628697087. The next prime is 628697123. The reversal of 628697101 is 101796826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574321225 + 54375876 = 23965^2 + 7374^2 .

It is a cyclic number.

It is not a de Polignac number, because 628697101 - 2²¹ = 626599949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628697131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314348550 + 314348551.

It is an arithmetic number, because the mean of its divisors is an integer number (314348551).

Almost surely, 2^628697101 is an apocalyptic number.

It is an amenable number.

628697101 is a deficient number, since it is larger than the sum of its proper divisors (1).

628697101 is an equidigital number, since it uses as much as digits as its factorization.

628697101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 628697101 is about 25073.8329937806. The cubic root of 628697101 is about 856.6705144156.

The spelling of 628697101 in words is "six hundred twenty-eight million, six hundred ninety-seven thousand, one hundred one".