491445865039 has 2 divisors, whose sum is σ = 491445865040. Its totient is φ = 491445865038.

The previous prime is 491445865021. The next prime is 491445865061. The reversal of 491445865039 is 930568544194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491445865039 - 2²¹ = 491443767887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491445865019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245722932519 + 245722932520.

It is an arithmetic number, because the mean of its divisors is an integer number (245722932520).

Almost surely, 2^491445865039 is an apocalyptic number.

491445865039 is a deficient number, since it is larger than the sum of its proper divisors (1).

491445865039 is an equidigital number, since it uses as much as digits as its factorization.

491445865039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 491445865039 in words is "four hundred ninety-one billion, four hundred forty-five million, eight hundred sixty-five thousand, thirty-nine".