1391630487869 has 2 divisors, whose sum is σ = 1391630487870. Its totient is φ = 1391630487868.

The previous prime is 1391630487857. The next prime is 1391630487979. The reversal of 1391630487869 is 9687840361931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1082286508900 + 309343978969 = 1040330^2 + 556187^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391630487869 - 2¹² = 1391630483773 is a prime.

It is a super-2 number, since 2×1391630487869² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391630483869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695815243934 + 695815243935.

It is an arithmetic number, because the mean of its divisors is an integer number (695815243935).

Almost surely, 2^{1391630487869} is an apocalyptic number.

It is an amenable number.

1391630487869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391630487869 is an equidigital number, since it uses as much as digits as its factorization.

1391630487869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47029248, while the sum is 65.

The spelling of 1391630487869 in words is "one trillion, three hundred ninety-one billion, six hundred thirty million, four hundred eighty-seven thousand, eight hundred sixty-nine".