1391002441889 has 2 divisors, whose sum is σ = 1391002441890. Its totient is φ = 1391002441888.

The previous prime is 1391002441877. The next prime is 1391002441951. The reversal of 1391002441889 is 9881442001931.

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., 785394750625 + 605607691264 = 886225^2 + 778208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391002441889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391002441819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695501220944 + 695501220945.

It is an arithmetic number, because the mean of its divisors is an integer number (695501220945).

Almost surely, 2^{1391002441889} is an apocalyptic number.

It is an amenable number.

1391002441889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391002441889 is an equidigital number, since it uses as much as digits as its factorization.

1391002441889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 1391002441889 in words is "one trillion, three hundred ninety-one billion, two million, four hundred forty-one thousand, eight hundred eighty-nine".