1245805021039 has 2 divisors, whose sum is σ = 1245805021040. Its totient is φ = 1245805021038.

The previous prime is 1245805020949. The next prime is 1245805021057. The reversal of 1245805021039 is 9301205085421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1245805021039 - 2¹⁹ = 1245804496751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1245805020992 and 1245805021010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245805024039) 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, 622902510519 + 622902510520.

It is an arithmetic number, because the mean of its divisors is an integer number (622902510520).

Almost surely, 2^{1245805021039} is an apocalyptic number.

1245805021039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245805021039 is an equidigital number, since it uses as much as digits as its factorization.

1245805021039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 1245805021039 in words is "one trillion, two hundred forty-five billion, eight hundred five million, twenty-one thousand, thirty-nine".