1230628561 has 2 divisors, whose sum is σ = 1230628562. Its totient is φ = 1230628560.

The previous prime is 1230628519. The next prime is 1230628591. The reversal of 1230628561 is 1658260321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214104336 + 16524225 = 34844^2 + 4065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230628561 - 2⁷ = 1230628433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1230628591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615314280 + 615314281.

It is an arithmetic number, because the mean of its divisors is an integer number (615314281).

Almost surely, 2^1230628561 is an apocalyptic number.

It is an amenable number.

1230628561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230628561 is an equidigital number, since it uses as much as digits as its factorization.

1230628561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1230628561 is about 35080.3158623180. The cubic root of 1230628561 is about 1071.6237497745.

Adding to 1230628561 its reverse (1658260321), we get a palindrome (2888888882).

The spelling of 1230628561 in words is "one billion, two hundred thirty million, six hundred twenty-eight thousand, five hundred sixty-one".