1391623263539 has 2 divisors, whose sum is σ = 1391623263540. Its totient is φ = 1391623263538.

The previous prime is 1391623263491. The next prime is 1391623263631. The reversal of 1391623263539 is 9353623261931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391623263539 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1391623263139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695811631769 + 695811631770.

It is an arithmetic number, because the mean of its divisors is an integer number (695811631770).

Almost surely, 2^{1391623263539} is an apocalyptic number.

1391623263539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391623263539 is an equidigital number, since it uses as much as digits as its factorization.

1391623263539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4723920, while the sum is 53.

The spelling of 1391623263539 in words is "one trillion, three hundred ninety-one billion, six hundred twenty-three million, two hundred sixty-three thousand, five hundred thirty-nine".