1291387904479 has 2 divisors, whose sum is σ = 1291387904480. Its totient is φ = 1291387904478.

The previous prime is 1291387904473. The next prime is 1291387904539. The reversal of 1291387904479 is 9744097831921.

It is a weak prime.

It is an emirp because it is prime and its reverse (9744097831921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291387904479 - 2¹⁹ = 1291387380191 is a prime.

It is a super-2 number, since 2×1291387904479² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1291387904479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291387904473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645693952239 + 645693952240.

It is an arithmetic number, because the mean of its divisors is an integer number (645693952240).

Almost surely, 2^{1291387904479} is an apocalyptic number.

1291387904479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291387904479 is an equidigital number, since it uses as much as digits as its factorization.

1291387904479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 1291387904479 in words is "one trillion, two hundred ninety-one billion, three hundred eighty-seven million, nine hundred four thousand, four hundred seventy-nine".