1391297678399 has 2 divisors, whose sum is σ = 1391297678400. Its totient is φ = 1391297678398.

The previous prime is 1391297678369. The next prime is 1391297678627. The reversal of 1391297678399 is 9938767921931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1391297678399 - 2²⁴ = 1391280901183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391297678359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695648839199 + 695648839200.

It is an arithmetic number, because the mean of its divisors is an integer number (695648839200).

Almost surely, 2^{1391297678399} is an apocalyptic number.

1391297678399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391297678399 is an equidigital number, since it uses as much as digits as its factorization.

1391297678399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 277766496, while the sum is 74.

The spelling of 1391297678399 in words is "one trillion, three hundred ninety-one billion, two hundred ninety-seven million, six hundred seventy-eight thousand, three hundred ninety-nine".