1291915034581 has 2 divisors, whose sum is σ = 1291915034582. Its totient is φ = 1291915034580.

The previous prime is 1291915034519. The next prime is 1291915034621. The reversal of 1291915034581 is 1854305191921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840505737681 + 451409296900 = 916791^2 + 671870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291915034581 - 2¹⁵ = 1291915001813 is a prime.

It is a super-2 number, since 2×1291915034581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291915038581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645957517290 + 645957517291.

It is an arithmetic number, because the mean of its divisors is an integer number (645957517291).

Almost surely, 2^{1291915034581} is an apocalyptic number.

It is an amenable number.

1291915034581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291915034581 is an equidigital number, since it uses as much as digits as its factorization.

1291915034581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 49.

The spelling of 1291915034581 in words is "one trillion, two hundred ninety-one billion, nine hundred fifteen million, thirty-four thousand, five hundred eighty-one".