1245560621 has 2 divisors, whose sum is σ = 1245560622. Its totient is φ = 1245560620.

The previous prime is 1245560611. The next prime is 1245560627. The reversal of 1245560621 is 1260655421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 907515625 + 338044996 = 30125^2 + 18386^2 .

It is an emirp because it is prime and its reverse (1260655421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1245560621 - 2¹⁰ = 1245559597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245560627) 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, 622780310 + 622780311.

It is an arithmetic number, because the mean of its divisors is an integer number (622780311).

Almost surely, 2^1245560621 is an apocalyptic number.

It is an amenable number.

1245560621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245560621 is an equidigital number, since it uses as much as digits as its factorization.

1245560621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1245560621 is about 35292.5009173337. The cubic root of 1245560621 is about 1075.9405853997.

The spelling of 1245560621 in words is "one billion, two hundred forty-five million, five hundred sixty thousand, six hundred twenty-one".