1231830487549 has 2 divisors, whose sum is σ = 1231830487550. Its totient is φ = 1231830487548.

The previous prime is 1231830487543. The next prime is 1231830487603. The reversal of 1231830487549 is 9457840381321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884762221924 + 347068265625 = 940618^2 + 589125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231830487549 - 2³³ = 1223240552957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231830487549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231830487543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615915243774 + 615915243775.

It is an arithmetic number, because the mean of its divisors is an integer number (615915243775).

Almost surely, 2^{1231830487549} is an apocalyptic number.

It is an amenable number.

1231830487549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231830487549 is an equidigital number, since it uses as much as digits as its factorization.

1231830487549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 1231830487549 in words is "one trillion, two hundred thirty-one billion, eight hundred thirty million, four hundred eighty-seven thousand, five hundred forty-nine".