1245210545281 has 2 divisors, whose sum is σ = 1245210545282. Its totient is φ = 1245210545280.

The previous prime is 1245210545263. The next prime is 1245210545389. The reversal of 1245210545281 is 1825450125421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1235687908225 + 9522637056 = 1111615^2 + 97584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245210545281 - 2¹⁹ = 1245210020993 is a prime.

It is a super-2 number, since 2×1245210545281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1245210545221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622605272640 + 622605272641.

It is an arithmetic number, because the mean of its divisors is an integer number (622605272641).

Almost surely, 2^{1245210545281} is an apocalyptic number.

It is an amenable number.

1245210545281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245210545281 is an equidigital number, since it uses as much as digits as its factorization.

1245210545281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128000, while the sum is 40.

The spelling of 1245210545281 in words is "one trillion, two hundred forty-five billion, two hundred ten million, five hundred forty-five thousand, two hundred eighty-one".