1391493454993 has 2 divisors, whose sum is σ = 1391493454994. Its totient is φ = 1391493454992.

The previous prime is 1391493454991. The next prime is 1391493454997. The reversal of 1391493454993 is 3994543941931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1375197145344 + 16296309649 = 1172688^2 + 127657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391493454993 - 2¹ = 1391493454991 is a prime.

It is a super-2 number, since 2×1391493454993² (a number of 25 digits) contains 22 as substring.

Together with 1391493454991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1391493454991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695746727496 + 695746727497.

It is an arithmetic number, because the mean of its divisors is an integer number (695746727497).

Almost surely, 2^{1391493454993} is an apocalyptic number.

It is an amenable number.

1391493454993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391493454993 is an equidigital number, since it uses as much as digits as its factorization.

1391493454993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56687040, while the sum is 64.

The spelling of 1391493454993 in words is "one trillion, three hundred ninety-one billion, four hundred ninety-three million, four hundred fifty-four thousand, nine hundred ninety-three".