1491000065441 has 2 divisors, whose sum is σ = 1491000065442. Its totient is φ = 1491000065440.

The previous prime is 1491000065437. The next prime is 1491000065531. The reversal of 1491000065441 is 1445600001941.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341899827216 + 149100238225 = 1158404^2 + 386135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491000065441 - 2² = 1491000065437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1491000065041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745500032720 + 745500032721.

It is an arithmetic number, because the mean of its divisors is an integer number (745500032721).

Almost surely, 2^{1491000065441} is an apocalyptic number.

It is an amenable number.

1491000065441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491000065441 is an equidigital number, since it uses as much as digits as its factorization.

1491000065441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 1491000065441 in words is "one trillion, four hundred ninety-one billion, sixty-five thousand, four hundred forty-one".