1291479386697 has 6 divisors (see below), whose sum is σ = 1865470225242. Its totient is φ = 860986257792.

The previous prime is 1291479386677. The next prime is 1291479386699. The reversal of 1291479386697 is 7966839741921.

1291479386697 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 479 + 3 + 8 + 66 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 994306128201 + 297173258496 = 997149^2 + 545136^2 .

It is not a de Polignac number, because 1291479386697 - 2⁶ = 1291479386633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291479386699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71748854808 + ... + 71748854825.

It is an arithmetic number, because the mean of its divisors is an integer number (310911704207).

Almost surely, 2^{1291479386697} is an apocalyptic number.

It is an amenable number.

1291479386697 is a deficient number, since it is larger than the sum of its proper divisors (573990838545).

1291479386697 is a wasteful number, since it uses less digits than its factorization.

1291479386697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143497709639 (or 143497709636 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 72.

The spelling of 1291479386697 in words is "one trillion, two hundred ninety-one billion, four hundred seventy-nine million, three hundred eighty-six thousand, six hundred ninety-seven".